CN114608700B - Laser energy measurement device and method based on quantitative water direct absorption - Google Patents
Laser energy measurement device and method based on quantitative water direct absorption Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 177
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 129
- 238000005259 measurement Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
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- 238000002474 experimental method Methods 0.000 claims description 10
- 238000002834 transmittance Methods 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 description 6
- 238000000691 measurement method Methods 0.000 description 6
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- 238000012544 monitoring process Methods 0.000 description 5
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- 238000009834 vaporization Methods 0.000 description 4
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- 238000003756 stirring Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 238000009529 body temperature measurement Methods 0.000 description 1
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
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Abstract
The invention provides a laser energy measuring device and method based on quantitative water direct absorption, which are used for solving the technical problems of huge system, complex device and high measurement uncertainty of a high-energy laser energy measuring device in the prior art. The invention provides a laser energy measuring device based on quantitative water direct absorption, which comprises a sealed cavity, heat absorption medium water, a first temperature sensor and a pressure sensor, wherein the sealed cavity is provided with a first temperature sensor; the periphery of the sealing cavity is provided with an outer wall, the laser light-receiving surface of the sealing cavity is provided with a glass window, and the outer wall and the end face of the glass window are sealed and surrounded to form the sealing cavity; the sealing cavity is internally provided with heat absorption medium water and a stirrer connected with an external motor; the inner side and the outer side of the outer wall are both provided with heat insulation layers. According to the measuring method provided by the invention, the heat absorption medium water in the sealed cavity is used as the laser absorption medium, and the total energy of the incident laser is obtained by utilizing the temperature difference between the highest temperature and the initial temperature of the heat absorption medium water.
Description
Technical Field
The invention relates to a high-energy laser energy measuring device, in particular to a laser energy measuring device based on quantitative water direct absorption and a measuring method thereof.
Background
In recent years, lasers are widely used in a plurality of fields such as scientific research and industrial production, and energy measurement of lasers is not needed in the production, development and application processes of lasers. However, accurate laser energy measurement is difficult.
At present, a great deal of work has been done to measure laser energy. Typical laser energy measurement methods include three types: 1. the passive absorption method uses pure solid such as metal or graphite as an absorber, and obtains laser energy by measuring the temperature rise of the absorber. The method has a simple structure, involves fewer physical processes, is a measuring method with higher precision, but has lower laser damage resistance threshold of the absorption cavity, is only suitable for laser measurement with lower power density, and has huge volume of the absorber when used for high-energy laser measurement, thereby leading the measuring system to be huge. 2. The active cooling method includes the first absorbing laser with solid absorber, the subsequent cooling with circulating water, and the final measurement of the temperature rise of the circulating water before and after entering the absorber to obtain laser energy. 3. In the flowing water direct absorption method, laser irradiates into water through a glass window of an absorption cavity, in order to measure for a long time and reduce vaporization of the water, the water needs to flow rapidly, and laser energy is obtained by measuring the temperature difference of water at an inlet and an outlet. The active cooling method and the running water direct absorption method obviously improve the measurement power and the upper energy limit of the system, but the measurement devices of the two methods are complex, the involved physical processes are more, in order to calculate the laser energy, the mass flow and the temperature rise of the water are required to be measured, the larger water flow involved in the two methods is required to be measured by adopting a volume flowmeter, and the water is likely to change phase in the measurement process, so that the measurement error of the mass flow of the water is larger, and the measurement uncertainty of the system is higher.
Disclosure of Invention
The invention aims to solve the technical problems of huge system, complex device and high measurement uncertainty of a high-energy laser energy measurement device in the prior art, and provides a laser energy measurement device and method based on quantitative water direct absorption.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
the laser energy measuring device based on quantitative water direct absorption is characterized in that: comprises a sealing cavity, heat absorption medium water, a first temperature sensor and a pressure sensor;
The periphery of the sealing cavity is provided with an outer wall, the laser light-receiving surface of the sealing cavity is provided with a glass window, and the glass window is used for allowing laser to enter the sealing cavity; the outer wall and the end face of the glass window are sealed and surrounded to form the sealed cavity;
The sealed cavity is internally provided with heat absorption medium water and a stirrer connected with an external motor, and the stirrer rotates under the drive of the motor to accelerate the heat balance of the heat absorption medium water, so that the water temperature in the cavity is uniform; the top of the cavity is provided with a pressurized exhaust port for increasing pressure in the cavity or exhausting gas during water injection, and one side close to the bottom is provided with a water injection outlet; the pressurizing exhaust port is provided with a first high-pressure valve, and the water injection drain port is provided with a second high-pressure valve;
The first temperature sensor and the pressure sensor are arranged on the outer wall, the measuring parts of the first temperature sensor and the pressure sensor are all positioned in the sealing cavity, the first temperature sensor is used for measuring the temperature of water in the sealing cavity, the pressure sensor is used for monitoring the pressure in the sealing cavity, and preferably, the pressure sensor is a quick response pressure sensor;
And the inner side and the outer side of the outer wall are respectively provided with a heat insulation layer for increasing the thermal resistance between the heat absorption medium water and the outer wall and between the outer wall and the environment and reducing the heat loss of the heat absorption medium water.
Further, a second temperature sensor is installed on the outer wall, and is used for monitoring the temperature of the outer wall, and the temperature can be used for correcting and compensating the measurement result, so that the measurement uncertainty is improved, and a thermistor type sensor or a thermocouple type sensor can be adopted for the first temperature sensor and the second temperature sensor.
Further, the outer wall is provided with a plurality of second temperature sensors located inside the outer wall at different positions.
Further, the pressure resistance of the sealing cavity is not lower than 1MPa.
Further, the depth of the sealing cavity is d, the depth d of the sealing cavity is determined by the transmission distance of the laser to be measured in water, the transmission distance x of the laser in water can be obtained according to the beer lambert law, and the specific formula is as follows:
x＝-ln(T)/α
wherein T represents transmittance, and alpha is absorption coefficient; when the transmittance t=0.99, the value of the depth d of the sealed cavity is determined by a calculated value larger than the transmission distance x of the laser in the water.
Further, the method for calculating the volume of the sealed cavity comprises the following steps of
Wherein V is the volume of the sealed cavity, Q is the total energy of incident laser, c p is the constant pressure specific heat capacity of the heat absorption medium water, ρ is the density of the heat absorption medium water, and DeltaT is the temperature rise of the heat absorption medium water.
Further, the volume of the heat absorption medium water is slightly smaller than that of the sealing cavity and is 95-99% of that of the sealing cavity.
Further, the heat insulation layer adopts a heat insulation layer of a waterproof heat insulation sponge tape.
Meanwhile, the invention also provides a laser energy measurement method based on quantitative water direct absorption, which is characterized by comprising the following steps:
1) Firstly, a second high-pressure valve is opened, heat absorption medium water is added into a sealed cavity through a water injection and drainage outlet, meanwhile, a first high-pressure valve is opened for exhausting when water is added, after the water is added into a set volume, the first high-pressure valve and the second high-pressure valve are closed, the initial temperature of the heat absorption medium water in the sealed cavity is recorded through a first temperature sensor, and the initial pressure in the cavity is recorded through a pressure sensor;
2) Laser to be measured is irradiated into the sealing cavity through the glass window, propagates in the heat absorption medium water, is continuously absorbed by the heat absorption medium water, is converted into the internal energy of the heat absorption medium water, and is continuously stirred by the stirrer to accelerate the heat balance of water temperature; meanwhile, the pressure sensor monitors the pressure in the cavity, if the pressure rises sharply, the experiment is stopped, the volume of heat absorption medium water is reduced, the experiment is carried out again, and if the pressure is stable, the experiment is continued;
3) After the laser is stopped, continuously measuring the temperature of the heat absorption medium water in the sealed cavity through a first temperature sensor, recording the maximum water temperature, using the difference between the maximum water temperature and the initial value as the temperature rise, and calculating the laser power.
Further, in step 1), after the heat absorption medium water is added into the sealed cavity, the sealed cavity is pressurized by adopting high-pressure gas through the first high-pressure valve, so that when the pressure in the sealed cavity is higher than the atmospheric pressure, the first high-pressure valve is closed.
Compared with the prior art, the invention has the beneficial effects that:
1. The laser energy measuring device based on quantitative water direct absorption provided by the invention adopts the heat absorption medium water in the sealed cavity as the laser absorption medium, and obtains the total energy of incident laser by measuring the temperature change of the heat absorption medium water, has the characteristic of high laser damage resistance threshold, can be suitable for energy measurement of high-energy laser, and has smaller volume of an absorber compared with a device of a passive absorption method, so that a measuring system is smaller.
2. Compared with the devices of the active cooling method and the running water type direct absorption method, the laser energy measuring device based on quantitative water direct absorption provided by the invention has the advantages that the measuring system is simpler, the uncertainty source is less, and the accuracy of laser energy measurement is ensured.
3. The laser energy measuring device based on direct absorption of quantitative water is easy to insulate heat from the outside, can obviously reduce heat loss, and can obtain incident laser energy with higher accuracy through temperature rise of heat absorption medium water.
4. According to the laser energy measuring device based on quantitative water direct absorption, the heat insulation layers made of the waterproof heat insulation sponge adhesive tapes are arranged on the inner side and the outer side of the outer wall, the heat conductivity of the heat insulation sponge adhesive tapes is far smaller than that of stainless steel, the heat resistance between heat absorption medium water and the sealing cavity can be remarkably increased, the temperature of the outer wall is recorded by the second temperature sensor arranged on the outer wall, so that the heat conducted by the heat absorption medium water to the outer wall is obtained, and the heat can be used for correcting results.
5. The invention provides a laser energy measuring device based on quantitative water direct absorption, which is characterized in that a plurality of second temperature sensors with measuring parts positioned in the outer wall are arranged at different positions of the outer wall of a sealed cavity, the temperature rise of the outer wall in multiple directions is measured in real time, the energy transmitted to the outer wall by heat absorption medium water is obtained according to mass calculation, and the measuring result is compensated.
6. According to the laser power energy measurement method based on quantitative water, the heat absorption medium water in the sealed cavity is used as a laser absorption medium, and the total energy of incident laser is obtained by utilizing the temperature difference between the highest temperature and the initial temperature of the heat absorption medium water. Compared with an active cooling method and a flowing water direct absorption method, the quality of the heat absorption medium water in the sealed cavity is unchanged before and after measurement, and the heat absorption medium water can be accurately measured, so that the problem of high measurement uncertainty of the laser energy measuring device is solved, and high-precision measurement of laser energy can be realized.
7. According to the laser energy measurement method based on quantitative water direct absorption, in the step 1), high-pressure gas is adopted to pressurize the sealed cavity, so that the generation of bubbles can be greatly reduced, the influence of local vaporization of water on measurement is reduced, and the measurement accuracy is improved.
8. According to the laser energy measurement method based on quantitative water direct absorption, in the step 2), the stirrer is used for continuously stirring the heat absorption medium water, so that the heat balance of water temperature is accelerated, and the measurement accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a laser energy measurement device based on quantitative water direct absorption;
FIG. 2 is a graph showing the temperature rise variation obtained at different laser energies according to an embodiment of the present invention;
The reference numerals are explained as follows:
1-an outer wall; 2-glass window; 3-heat absorbing medium water; 4-a first temperature sensor; 5-a pressure sensor; 6-a second temperature sensor; 7-a pressurized exhaust port; 8-a first high pressure valve; 9-a heat insulation layer; 10-a stirrer; 11-a second high pressure valve; 12-water filling and draining outlet.
Detailed Description
To further clarify the advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1, a laser energy measuring device based on quantitative water direct absorption comprises a sealed cavity, heat absorption medium water 3, a first temperature sensor 4, a second temperature sensor 6 and a pressure sensor 5; the periphery of the sealing cavity is provided with an outer wall 1, a glass window 2 is arranged on the laser light-receiving surface of the sealing cavity, the outer wall 1 and the glass window 2 are sealed by using a sealing gasket to form a high-pressure-resistant sealing cavity. Preferably, the pressure resistance of the sealed cavity is not lower than 1MPa, the outer wall 1 is made of stainless steel with low heat conductivity and strong pressure resistance, and the glass window 2 is made of quartz glass with low laser absorption coefficient.
A fixed amount of heat absorbing medium water 3 and a stirrer 10 connected with an external motor are arranged in the sealed cavity. The invention finally obtains the incident laser energy by utilizing the temperature change of the quantitative heat absorption medium water 3, the stirrer 10 is made of plastic materials, the heat conductivity coefficient is reduced as much as possible, the stirrer is connected with an external motor in a sealing transmission mode, the stirrer 10 drives the heat absorption medium water 3 in the stirring cavity through the external motor to make the water temperature in the cavity uniform, and the heat balance of the heat absorption medium water 3 is effectively accelerated. The top of the sealed cavity is provided with a pressurized exhaust port 7 for increasing pressure in the cavity or exhausting gas during water injection, one side of the sealed cavity close to the bottom is provided with a water injection outlet 12, the pressurized exhaust port 7 is provided with a first high-pressure valve 8, the water injection outlet 12 is provided with a second high-pressure valve 11, and the first high-pressure valve 8 and the second high-pressure valve 11 are respectively used for controlling the closing and opening of the pressurized exhaust port 7 and the water injection outlet 12. The first temperature sensor 4 and the pressure sensor 5 are respectively fixed at the top of the outer wall 1, and the measuring parts are all positioned in the sealed cavity. The first temperature sensor 4 is used for monitoring the temperature of the heat absorption medium water 3 in the sealed cavity, and the temperature measurement range is 0-100 ℃; the pressure sensor 5 is used for monitoring the pressure in the cavity, and the measuring range is 0.1-1 MPa. The second temperature sensor 6 is installed at the top of the outer wall 1, and its measuring part is located inside the outer wall 1 and used for monitoring the temperature of the outer wall 1, and the temperature can be used for correcting and compensating the measuring result, so that the measuring accuracy is improved. The first temperature sensor 4 and the second temperature sensor 6 may employ a thermistor type or a thermocouple type sensor. In order to avoid heat energy loss of the heat absorption medium water 3, the inner side and the outer side of the outer wall 1 are respectively provided with a heat insulation layer 9, the heat insulation layers 9 are waterproof heat insulation sponge tapes for increasing the heat resistance between the heat absorption medium water 3 and the outer wall 1 and between the outer wall 1 and the environment, and the method can greatly reduce the heat loss of the heat absorption medium water 3 to the outside although the heat absorption medium water 3 cannot be completely insulated from the outside environment, so that the heat insulation is approximately realized within a few seconds.
The volume of the sealed cavity is designed according to the total energy of laser to be measured, and the calculation method comprises the following steps:
In the above formula, V is the volume of the sealed cavity, Q is the total energy of incident laser, c p is the constant-pressure specific heat capacity of the heat absorption medium water 3, ρ is the density of the heat absorption medium water 3, and Δt is the temperature rise of the heat absorption medium water 3.
In order to achieve a better measurement effect, the volume of the heat absorption medium water 3 in the sealed cavity is slightly smaller than that of the sealed cavity, the volume of the heat absorption medium water 3 is 95-99% of that of the sealed cavity, and according to temperature rise estimation, the rapid rise of the pressure in the cavity is ensured not to occur under the action of laser when the water in the sealed cavity is overfilled.
The depth of the sealing cavity is d, the transmission distance x of the laser to be measured in water can be obtained according to the beer lambert law, and the specific formula is as follows:
x＝-ln(T)/α
Wherein T represents transmittance, and alpha is absorption coefficient; when the transmittance t=0.99, the value of the depth d of the sealed cavity is determined by a calculated value larger than the transmission distance x of the laser in the water, and for the laser with about 1 micron, the calculated transmission distance x of the laser in the water is about 10cm, and the value of the depth d of the sealed cavity can be 20cm.
The invention also provides a laser energy measurement method based on quantitative water direct absorption, which comprises the following specific steps:
1) Firstly, a second high-pressure valve 11 is opened, heat absorption medium water 3 is added into a sealed cavity through a water injection and drainage outlet 12, meanwhile, a first high-pressure valve 8 is opened for exhausting when water is added, after the water is added into a set volume, the second high-pressure valve 11 is closed, high-pressure gas is adopted to pressurize the sealed cavity through the first high-pressure valve 8, so that the pressure in the sealed cavity reaches 0.2Mpa, then the first high-pressure valve 8 is closed, the initial temperature of the heat absorption medium water 3 in the sealed cavity is recorded through a first temperature sensor 4, and the initial pressure in the cavity is recorded through a pressure sensor 5;
2) Laser to be measured is irradiated into the sealed cavity through the glass window 2, propagates in the heat absorption medium water 3, is continuously absorbed by the heat absorption medium water 3, is converted into the internal energy of the heat absorption medium water 3, and is continuously stirred by the stirrer 10 to accelerate the heat balance of water temperature; meanwhile, the pressure sensor 5 monitors the pressure in the cavity, if the pressure rises sharply, the experiment is terminated, the volume of the heat absorption medium water 3 is reduced, the experiment is carried out again, and if the pressure is stable, the experiment is continued;
3) After the laser is stopped, the temperature of the heat absorption medium water 3 in the sealed cavity is continuously measured through the first temperature sensor 4, the water temperature maximum value is recorded, the difference between the temperature maximum value and the initial value is used as temperature rise, and the laser power is calculated.
In step 1), the purpose of pressurizing the sealed cavity is to make the heat absorption medium water 3 uniformly absorb the incident laser light. The test result shows that when laser light is incident into water under normal pressure, a large number of bubbles are generated in the heat absorption medium water 3 due to partial vaporization, the bubbles influence the absorption of the heat absorption medium water 3 on the laser light, and even the stirring water temperature through the stirrer 10 also fluctuates, so that the output value of the first temperature sensor 4 contains ripple signals, and further the measurement accuracy is influenced; by pressurizing the sealed cavity, the generation of bubbles can be greatly reduced, the influence of the local vaporization of the heat absorption medium water 3 on measurement is reduced, and the measurement accuracy is improved.
In order to ensure the measurement accuracy, three heat losses of the measurement system, namely heat conduction of the heat absorption medium water 3 to the outer wall 1 of the sealed cavity, heat conduction of the heat absorption medium water 3 to the glass window 2 and radiation heat exchange of the heat absorption medium water 3 to the space through the glass window 2, are also considered.
In order to reduce heat loss, the invention provides three measures, firstly, a heat insulation layer 9 adopting a waterproof heat insulation sponge tape is stuck on the inner surface and the outer surface of the outer wall 1, the heat conductivity of the waterproof heat insulation sponge tape is far smaller than that of stainless steel, and the heat resistance between the heat absorption medium water 3 and the outer wall 1 can be obviously increased; and the second temperature sensor 6 arranged on the outer wall 1 is used for recording the temperature of the outer wall 1, so that the heat conducted by the heat absorption medium water 3 to the outer wall 1 is obtained, and the heat can be used for correcting the result. Secondly, the glass window 2 adopts quartz glass with lower laser absorption coefficient, and the heat conductivity of the glass is far lower than that of stainless steel, so that the heat conduction loss of the heat absorption medium water 3 to the glass window 2 is smaller. Thirdly, the temperature rise of the heat absorption medium water 3 is controlled within 20 degrees through the estimated total laser energy and the mass of the heat absorption medium water 3, and the radiation heat exchange of the heat absorption medium water 3 to the space through the glass window 2 is smaller because the temperature rise of the heat absorption medium water 3 is not high. Finally, the total energy of the incident laser light can be obtained by using the temperature difference between the highest temperature of the heat absorbing medium water 3 in the sealed cavity and the initial temperature.
The experimental study is carried out by designing and processing a measuring device aiming at the laser to be measured with the energy range of 1-120 kJ. Experiments show that after the laser is stopped, the maximum temperature of the heat absorption medium water can be reached after about tens of seconds, and the heat absorption medium water can be kept unchanged within a few seconds, so that the overall heat loss of the system is small, and the waterproof heat insulation layer plays a key role. The maximum value of the temperature rise signal at this time is recorded and compared with the incident laser energy to obtain the relationship between different laser energy and temperature rise as shown in fig. 2, and the result shows that the temperature rise increases linearly with the increase of the laser energy, which indicates that the energy value of the laser can be obtained by measuring the temperature of the heat absorption medium water 3. Since the heat loss of the measuring system is small and the mass of the heat absorbing medium water 3 does not change before and after the measurement, the overall measurement uncertainty of the measuring method is greatly reduced.
In order to further improve the measurement accuracy, referring to fig. 1, we can install a plurality of second temperature sensors 6 on the outer wall 1, measure the temperature rise of the outer wall 1 in multiple directions in real time, and calculate the energy transferred to the outer wall 1 by the heat absorption medium water 3 according to the mass, so as to compensate the measurement result. In addition, it is desirable that the laser energy be obtained by utilizing the temperature rise of the heat absorbing medium water 3 in the sealed cavity in the case where the heat absorbing medium water 3 is completely insulated. However, due to unavoidable heat loss, the calibration is performed by adopting a laser or electric heating mode before measurement so as to improve the accuracy of measurement.
The foregoing description is only for the purpose of illustrating the technical solution of the present invention, but not for the purpose of limiting the same, and it will be apparent to those of ordinary skill in the art that modifications may be made to the specific technical solution described in the foregoing embodiments, or equivalents may be substituted for parts of the technical features thereof, without departing from the spirit of the technical solution of the present invention.
Claims (8)
1. The utility model provides a laser energy measuring device based on quantitative water direct absorption which characterized in that: comprises a sealing cavity, heat absorption medium water (3), a first temperature sensor (4) and a pressure sensor (5);
the periphery of the sealing cavity is an outer wall (1), and a glass window (2) is arranged on the laser light-facing surface of the sealing cavity; the end surfaces of the outer wall (1) and the glass window (2) are sealed and surrounded to form the sealed cavity;
The sealing cavity is internally provided with heat absorption medium water (3) and a stirrer (10) connected with an external motor; the top of the water tank is provided with a pressurized exhaust port (7), and one side close to the bottom is provided with a water injection outlet (12);
A first high-pressure valve (8) is arranged on the pressurizing exhaust port (7), and a second high-pressure valve (11) is arranged on the water injection drain port (12);
The first temperature sensor (4) and the pressure sensor (5) are arranged on the outer wall (1), and the measuring parts of the first temperature sensor and the pressure sensor are positioned in the sealed cavity;
the inner side and the outer side of the outer wall (1) are provided with heat insulation layers (9);
The depth of the sealed cavity is d, the depth d of the sealed cavity is determined by the transmission distance of the laser to be measured in water, the transmission distance x of the laser in water is obtained according to the Bill law, and the specific formula is as follows:
x＝-ln(T)/α
Wherein T represents transmittance, and alpha is absorption coefficient; when the transmittance t=0.99, the value of the depth d of the sealed cavity is determined by a calculated value larger than the transmission distance x of the laser in the water;
the volume of the sealing cavity is as follows:
Wherein V is the volume of the sealed cavity, Q is the total energy of incident laser, c p is the constant pressure specific heat capacity of the heat absorption medium water (3), ρ is the density of the heat absorption medium water (3), and DeltaT is the temperature rise of the heat absorption medium water (3).
2. The laser energy measurement device based on quantitative water direct absorption as set forth in claim 1, wherein: the outer wall (1) is provided with a second temperature sensor (6) of which the measuring part is positioned inside the outer wall (1).
3. A laser energy measurement device based on quantitative water direct absorption as claimed in claim 2, wherein: the outer wall (1) is provided with a plurality of measuring parts at different positions and is positioned in a second temperature sensor (6) inside the outer wall (1).
4. A laser energy measurement device based on direct absorption of quantified water as defined in claim 3, characterized in that: the pressure resistance of the sealing cavity is not lower than 1MPa.
5. The laser energy measurement device based on quantitative water direct absorption of claim 4, wherein: the volume of the heat absorption medium water (3) is 95-99% of the volume of the sealed cavity.
6. The laser energy measurement device based on quantitative water direct absorption of claim 5, wherein: the heat insulation layer (9) adopts a waterproof heat insulation sponge adhesive tape.
7. A method for measuring laser energy based on quantitative water direct absorption, characterized in that a laser energy measuring device based on quantitative water direct absorption according to any one of claims 1-6 is based on, comprising the steps of:
1) firstly, opening a second high-pressure valve (11), adding heat absorption medium water (3) into a sealed cavity through a water injection outlet (12), simultaneously opening a first high-pressure valve (8) for exhausting when adding water, closing the first high-pressure valve (8) and the second high-pressure valve (11) after adding the water to a set volume, recording the initial temperature of the heat absorption medium water (3) in the sealed cavity through a first temperature sensor (4), and recording the initial pressure in the cavity through a pressure sensor (5);
2) Laser to be measured is irradiated into the sealed cavity through the glass window (2), propagates in the heat absorption medium water (3), is continuously absorbed by the heat absorption medium water (3), is converted into the internal energy of the heat absorption medium water (3), and is continuously stirred by the stirrer (10), so that the heat balance of water temperature is accelerated; meanwhile, the pressure in the sealed cavity is monitored through the pressure sensor (5), if the pressure rises sharply, the experiment is terminated, the volume of the heat absorption medium water (3) is reduced, the experiment is carried out again, and if the pressure is stable, the experiment is continued;
3) After the laser is stopped, the temperature of the heat absorption medium water (3) in the sealed cavity is continuously measured through a first temperature sensor (4), the water temperature maximum is recorded, the difference between the temperature maximum and the initial value is used as the temperature rise, and the laser power is calculated.
8. The method for measuring laser energy based on direct absorption of quantitative water according to claim 7, wherein in step 1), after the heat absorption medium water (3) is added into the sealed cavity, high-pressure gas is used to pressurize the sealed cavity through the first high-pressure valve (8), so that when the pressure in the sealed cavity is higher than the atmospheric pressure, the first high-pressure valve (8) is closed again.
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| CN202210189287.1A CN114608700B (en) | 2022-02-28 | 2022-02-28 | Laser energy measurement device and method based on quantitative water direct absorption |
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| CN202210189287.1A CN114608700B (en) | 2022-02-28 | 2022-02-28 | Laser energy measurement device and method based on quantitative water direct absorption |
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| CA2385280A1 (en) * | 2001-05-10 | 2002-11-10 | Bayer Aktiengesellschaft | Device and method for carrying out experiments in parallel |
| CN103148948A (en) * | 2013-02-06 | 2013-06-12 | 西北核技术研究所 | Device for measuring high-energy laser energy |
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| US9441416B2 (en) * | 2012-09-27 | 2016-09-13 | Guardian Industries Corp. | Low temperature hermetic sealing via laser |
| CN103398785B (en) * | 2013-07-26 | 2015-10-28 | 西北核技术研究所 | Based on the energy measurement of high energy laser measurement mechanism of rotary absorber |
| US11523752B2 (en) * | 2017-02-16 | 2022-12-13 | Essenlix Corporation | Assay for vapor condensates |
| US20200355605A1 (en) * | 2019-03-05 | 2020-11-12 | Optiscan Biomedical Corporation | Automated fluid analysis using tunable optical sources |
| CN209997616U (en) * | 2019-03-27 | 2020-01-31 | 华研环科(北京)科技有限公司 | style high-capacity stirring hydrothermal kettle |
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| CA2385280A1 (en) * | 2001-05-10 | 2002-11-10 | Bayer Aktiengesellschaft | Device and method for carrying out experiments in parallel |
| CN103148948A (en) * | 2013-02-06 | 2013-06-12 | 西北核技术研究所 | Device for measuring high-energy laser energy |
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