CN204649963U - Laser distance measuring system - Google Patents
Laser distance measuring system Download PDFInfo
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- CN204649963U CN204649963U CN201520387801.8U CN201520387801U CN204649963U CN 204649963 U CN204649963 U CN 204649963U CN 201520387801 U CN201520387801 U CN 201520387801U CN 204649963 U CN204649963 U CN 204649963U
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Abstract
The utility model discloses a kind of laser distance measuring system, laser distance measuring system comprises emission coefficient, control and metering circuit, receiving system, laser distance measuring system emission coefficient, control and metering circuit, receiving system connect successively, emission coefficient is made up of LASER Light Source, beam-expanding collimation system, spatial light modulator, and LASER Light Source, beam-expanding collimation system, spatial light modulator connect successively.The utility model improves stability and reduces costs.
Description
Technical field
The utility model relates to a kind of range measurement system, particularly relates to a kind of laser distance measuring system.
Background technology
Laser ranging (laser distance measuring) is found range using laser instrument as light source.Continuous wave laser and pulsed laser is divided into according to the mode of laser work.The gas lasers such as He-Ne, argon ion, krypton cadmium work in continuous output state, for phase laser distance measurement; Two heterogeneous gallium arsenide semiconductor laser instrument, for infrared distance measurement; The solid state laser such as ruby, neodymium glass, finds range for pulse type laser.Laser range finder is due to features such as the monochromaticity of laser is good, high directivities, add that electronic circuit semiconductor transformation is integrated, compared with electro-optical distance instrument, not only can day and night operation but also can distance accuracy be improved, remarkable minimizing weight and power consumption, make the distance measuring the target far away such as artificial earth satellite, the moon come true.
Laser range finder utilizes laser to carry out the instrument of Accurate Determining to the distance of target.Laser range finder is operationally to a branch of very thin laser of target injection, and the laser beam reflected by photovalve receiving target, timer measures laser beam from the time being transmitted into reception, calculates from observer's range-to-go.The direction not stopping to change laser beam is needed in some laser distance measuring system, the time of being returned by the laser beam reflection scanning different angles is calculated body form or calculates in different distance whether there is barrier (such as the laser scanning and ranging of automobile active safety), current change radiating laser beams angle is completed by electron scanning galvanometer, there is cost high, the problems such as poor stability.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of laser distance measuring system, it utilizes the interference diffraction of light, changed type and the angle of output beam by spatial light modulator as required, and do not comprise any moving component, improve stability, reduce costs.
The utility model solves above-mentioned technical matters by following technical proposals: a kind of laser distance measuring system, it is characterized in that, it comprises emission coefficient, control and metering circuit, receiving system, laser distance measuring system emission coefficient, control and metering circuit, receiving system connect successively, emission coefficient is made up of LASER Light Source, beam-expanding collimation system, spatial light modulator, and LASER Light Source, beam-expanding collimation system, spatial light modulator connect successively.
Preferably, described spatial light modulator can be connected with an optical system.Optical system may be used for the shooting angle zooming in or out light beam, or covers the unwanted order of diffraction.
Preferably, described optical system comprises lens and diaphragm.
Preferably, described LASER Light Source adopts semiconductor laser.
Preferably, described spatial light modulator is liquid crystal on silicon.
Positive progressive effect of the present utility model is: the utility model laser distance measuring system improves stability and reduces costs.The utility model laser distance measuring system may be used for the field such as automobile collision preventing alarm, laser three-dimensional scanning mapping.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model laser distance measuring system.
Embodiment
The utility model preferred embodiment is provided, to describe the technical solution of the utility model in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model laser distance measuring system comprises emission coefficient, control and metering circuit, receiving system, laser distance measuring system emission coefficient, control and metering circuit, receiving system connect successively, emission coefficient is made up of LASER Light Source, beam-expanding collimation system, spatial light modulator, and LASER Light Source, beam-expanding collimation system, spatial light modulator connect successively.Beam-expanding collimation system, receiving system can adopt existing beam-expanding collimation system, receiving system respectively, and the nest of such as Changchun University of Science and Technology fixes on the paper " design of phase laser distance measurement instrument receiving system " of 2010.Beam-expanding collimation system can adopt the beam-expanding collimation system that the patent No. is " 201010191189.9 ", patent name is the Chinese patent of " the generation method of holographical wave guide display and hologram image thereof ".
Spatial light modulator can be connected with an optical system, and optical system can comprise lens and diaphragm, and lens are used for zooming in or out the angle exporting light.The light beam that diaphragm produces for covering the unwanted order of diffraction.
The distance-finding method of the utility model laser distance measuring system comprises the following steps: the controlled and metering circuit of LASER Light Source controls to send laser pulse, LASER Light Source can adopt semiconductor laser, available visible ray or invisible light (such as 650nm wave band or 808nm wave band); Spatial light modulator is outputted to after the light beam-expanding collimation that LASER Light Source sends by beam-expanding collimation system; Spatial light modulator connection control and metering circuit (such as using LVDS or RGB888 interface to connect), the control signal modulated laser according to control and metering circuit exports; When the light beam that spatial light modulator exports meets with object, reflection or scattering (diffuse reflection) will be produced, receiving system will receive associated reflections or scattering (diffuse reflection) signal, and exporting control and metering circuit to, control and metering circuit calculate the distance between laser distance measuring system and testee (barrier) according to the mistiming that itself and laser pulse send.
Control and metering circuit are powered for spatial light modulator and LASER Light Source simultaneously.Control signal comprises data-signal (such as hologram), exports the Dan Shu of certain angle, multi beam or linear laser as controlled.Hologram is stored in advance in circuit of measurement and control after can being calculated by outer computer in advance, circuit of measurement and control chooses beam type signal (hologram) controls outgoing beam type (such as, single-point, multiple spot, line) and shooting angle by the mode of interference diffraction according to demand in real time.Hologram) can be generated in real time by circuit of measurement and control.Such as, according to Fraunhofer diffraction, distance equivalence beyond several meters can be become infinite distance, light beam spot position is calculated according to required shooting angle, the hologram being obtained its correspondence by Fourier or inverse Fourier transform (only retains the phase information quantized, normalized is done to strength information or gives up), export spatial light modulator to.Also such as, in nearer distance, can, according to fresnel diffraction, fractional Fourier or Fractional Inverse Fourier Transform be used to obtain the outgoing beam of better quality.Also such as, the Space Angle frequency spectrum of target light field can be used to be multiplied by the distance factor (being drawn by flight distance calculation) and to obtain its angular spectrum information in spatial light modulator afterwards, required amplitude and PHASE DISTRIBUTION is obtained again after inverse Fourier transform or Fourier transform, (such as give up amplitude after treatment, retain phase place, or by phase quantization) export spatial light modulator to.Space Angle spectrum information can obtain according to required beam angle, also Fourier transform or inverse Fourier transform can be used to obtain to target light field.Control signal also comprises synchronizing signal, the laser pulse that synchronous LASER Light Source sends, spatial light modulator and receiving system.Spatial light modulator adopts phase modulation method.Spatial light modulator can use liquid crystal on silicon (LCoS).
Control and metering circuit control the laser pulse frequency that LASER Light Source sends, and adjustable pulse strength.Control and metering circuit control the phase information (hologram) in spatial light modulator, phase information can generate in advance, and be stored in control and metering circuit, and by control and metering circuit selects display as required, also can by control and metering circuit generates in real time.Control and the synchronous laser pulse of metering circuit, the phase information of display in spatial light modulator and receiving system.
Above-described specific embodiment; the technical matters of solution of the present utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (5)
1. a laser distance measuring system, it is characterized in that, it comprises emission coefficient, control and metering circuit, receiving system, laser distance measuring system emission coefficient, control and metering circuit, receiving system connect successively, emission coefficient is made up of LASER Light Source, beam-expanding collimation system, spatial light modulator, and LASER Light Source, beam-expanding collimation system, spatial light modulator connect successively.
2. laser distance measuring system as claimed in claim 1, it is characterized in that, described spatial light modulator is connected with an optical system.
3. laser distance measuring system as claimed in claim 2, it is characterized in that, described optical system comprises lens and diaphragm.
4. laser distance measuring system as claimed in claim 1, is characterized in that, described LASER Light Source adopts semiconductor laser.
5. laser distance measuring system as claimed in claim 1, it is characterized in that, described spatial light modulator is liquid crystal on silicon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520387801.8U CN204649963U (en) | 2015-06-08 | 2015-06-08 | Laser distance measuring system |
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| CN201520387801.8U CN204649963U (en) | 2015-06-08 | 2015-06-08 | Laser distance measuring system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549029A (en) * | 2016-01-19 | 2016-05-04 | 中国工程物理研究院流体物理研究所 | Illumination scanning stack imaging system and method |
| CN106249245A (en) * | 2015-06-08 | 2016-12-21 | 江苏慧光电子科技有限公司 | LDMS and distance-finding method thereof |
| WO2018014252A1 (en) * | 2016-07-20 | 2018-01-25 | SZ DJI Technology Co., Ltd. | Circular light source for obstacle detection |
| WO2019041268A1 (en) * | 2017-08-31 | 2019-03-07 | SZ DJI Technology Co., Ltd. | A solid state light detection and ranging (lidar) system |
| US11675076B2 (en) | 2017-08-31 | 2023-06-13 | SZ DJI Technology Co., Ltd. | Solid state light detection and ranging (LIDAR) system and system and method for improving solid state light detection and ranging (LIDAR) resolution |
-
2015
- 2015-06-08 CN CN201520387801.8U patent/CN204649963U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249245A (en) * | 2015-06-08 | 2016-12-21 | 江苏慧光电子科技有限公司 | LDMS and distance-finding method thereof |
| CN106249245B (en) * | 2015-06-08 | 2021-03-09 | 江苏慧光电子科技有限公司 | Laser ranging system and ranging method thereof |
| CN105549029A (en) * | 2016-01-19 | 2016-05-04 | 中国工程物理研究院流体物理研究所 | Illumination scanning stack imaging system and method |
| WO2018014252A1 (en) * | 2016-07-20 | 2018-01-25 | SZ DJI Technology Co., Ltd. | Circular light source for obstacle detection |
| US11053005B2 (en) | 2016-07-20 | 2021-07-06 | SZ DJI Technology Co., Ltd. | Circular light source for obstacle detection |
| WO2019041268A1 (en) * | 2017-08-31 | 2019-03-07 | SZ DJI Technology Co., Ltd. | A solid state light detection and ranging (lidar) system |
| US11675076B2 (en) | 2017-08-31 | 2023-06-13 | SZ DJI Technology Co., Ltd. | Solid state light detection and ranging (LIDAR) system and system and method for improving solid state light detection and ranging (LIDAR) resolution |
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