CN2879148Y

CN2879148Y - Reflected light intensity modulating type temperature sensor

Info

Publication number: CN2879148Y
Application number: CN200620023528.1U
Authority: CN
Inventors: 李志军; 苏熙萍; 李文田
Original assignee: BAODING WUXING OPTICAL FIBER SENSING TECHNOLOGY CO LTD
Current assignee: BAODING WUXING OPTICAL FIBER SENSING TECHNOLOGY CO LTD
Priority date: 2006-02-15
Filing date: 2006-02-15
Publication date: 2007-03-14
Anticipated expiration: 2016-02-15

Abstract

The utility model relates to a reflecting type light regulating style temperature pickup, pertaining to fiber-optic temperature pickup technology and used for resolving sensor structure problem. The pickup consists of optical fibers, a reflected light image generating film, a reflected image generating cap, a torsion spring, a heat conducting part, a core and a shell body. All parts are enclosed in the body, wherein the optical fiber and core are concentrically horizontal, and the reflected light image generating film and the reflected image generating cap are respectively arranged at the ends where the optical fiber and the core face each other. And the other end of the optical fiber extends out of the shell body and the core connects with wring reed. The heat conducting parts are arranged at the side where the wring reed is, and the reflected light image generating film and the reflected image generating cap have a half circle hole to let in light. A reflecting film is equipped on the end surface of the core, while the end supports the body wall. The utility model has the advantages of simple structure, good linearity parameter, large linear range, high measurement precision and saving material etc and is especially suitable for on line measurement under dangerous condition like high voltage.

Description

Reflecting light modulation type temperature sensor

Technical field

The utility model relates to optical fiber temperature sensing device, belongs to the fibre optic temperature sensor technical field.

Background technology

At high voltage, big electric current, intense radiation, deep-etching, explosive, under the rugged surroundings such as many dirt, temperature is carried out on-line measurement with non-Fibre Optical Sensor means and apparatus, often run into the difficulty that is difficult to overcome.To measure the bus contact temperature under high voltage is example, and non-Fibre Optical Sensor means and apparatus are difficult to realize and the reasons such as electricity isolation of electric power primary system because antijamming capability is low, can't realize the contact real time on-line monitoring so far; The good anti-insulativity of optical fiber, characteristics such as strong anti-electromagnetic interference (EMI) and corrosion resistance and flexible are good make using optical fibre sensor implement the contact on-line measurement under high voltage environment and become a reality.Chinese patent 03239024 discloses a kind of " power high voltage contact on-line measuring device ", high-voltage contact light signal sensing device during this device constitutes is by heat-conduction component, the moving grating affixed with heat-conduction component, the quiet grating that moving relatively grating is provided with at interval, input, compositions such as output optical fibre, during the high-voltage contact temperature variation, heat-conduction component makes grating produce linear displacement, make output light signal generating linear change, pass through photoelectric conversion module, collection linear change signals such as signal processing module detect the high-voltage contact variation of temperature after comparing processing, thereby realize the contact real time on-line monitoring under the high voltage environment.High-voltage contact fibre-optical sensing device in this device adopts dynamic and static raster pattern version, and sensor is made complicated, needs into and out of two optical fiber, and it is on the low side also to have precision simultaneously, deficiencies such as poor linearity.For this reason, also need develop the Fibre Optical Sensor product of other version, to overcome the above-mentioned defective of existing product.

Summary of the invention

Technical problem to be solved in the utility model provide a kind of simple in structure, monitoring sensitivity is high, the linearity good, service-strong reflecting light modulation type temperature sensor.

The alleged problem of the utility model realizes with following technical scheme:

A kind of reflecting light modulation type temperature sensor is provided with optical fiber 1, reflected light figure generation diaphragm 2 in the formation, reflective graphics generates cap 3, torsion spring 4, conducting-heat elements 5, core body 6 and housing 7, and its all parts all are sealed in the housing, wherein:

Optical fiber 1 and core body 6 coaxial being flat in the housing 7, the reflected light figure generates diaphragm 2 and reflective graphics and generates cap 3 and lay respectively at the relative end of optical fiber 1 and core body 6, the other end of optical fiber 1 extends to outside the housing 7, and core body 6 connects torsion spring 4, and the other end of torsion spring 4 and housing 7 are affixed; Described conducting-heat elements 5 is arranged at torsion spring 4 one sides, the reflected light figure generates diaphragm 2 and reflective graphics generation cap 3 is equipped with the semicircle light hole, the end face of core body 6 is a reflectance coating 8, the axis coinciding of the center of circle of reflectance coating and optical fiber 1, and the other end of core body 6 is supported on the housing sidewall.

Above-mentioned reflecting light modulation type temperature sensor, described reflected light figure generate diaphragm 2 and reflective graphics generation cap 3 is fixed on optical fiber 1 or the core body 6 by cap tube 9,10 respectively.

Be convenient contact thermal measurement point, above-mentioned reflecting light modulation type temperature sensor, the upper end of described conducting-heat elements 5 extends to outside the housing 7.

The utility model utilizes torsion spring to be subjected to thermal deformation to drive the rotation of core body and reflective graphics generation cap, the locus that makes reflective graphics generate the relative reflected light figure generation of cap diaphragm changes, the light signal that the latter exported produces linear change in also just on a large scale thereupon, sets up a kind of funtcional relationship thereby make between the variation of light signal and the measured body temperature.The utility model has been developed the Fibre Optical Sensor of a kind of brand-new principle of work and version, it overcome existing dynamic and static grating type Fibre Optical Sensor make complicated, need that two optical fiber of turnover, poor linearity, monitoring accuracy are low etc. to use defective, have simple in structure, be easy to installation and processing, be convenient to produce in batches, the linear-in-the-parameter degree is good, the range of linearity is big, measuring accuracy is high, use is reliable, can save remarkable advantage such as 50% fiber optic materials.Suit under hazardous environments such as various occasions, especially high voltage, to carry out using in the on-line measurement system.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the right view of Fig. 3;

Fig. 3 is the cut-open view that amplify sensor core 6 ends among Fig. 1;

Fig. 4 is the cut-open view that amplify optical fiber 1 end among Fig. 1;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is the longitudinal section along the optical fiber axle center.

Each parts label is among the figure: 1-optical fiber, 2-reflected light figure generate diaphragm, the 3-reflective graphics generates cap, 4-torsion spring, 5-conducting-heat elements, 6-core body, 7-housing, 8-reflectance coating, 9,10-cap tube, 11-perforation.

Embodiment

Consult accompanying drawing.Reflected light figure in the utility model generates diaphragm 2 and reflective graphics generation cap 3 is the symmetric shape body of double combination, can be symmetrical semicircle or similar shape etc., the axis coinciding of the center of circle of semicircle and optical fiber 1 is semicircle in the illustrated example, upper and lower symmetrical placement.

The cap tube 9 that the reflected light figure generates diaphragm 2 is a reducing cap tube, the barrel dliameter at rear portion and optical fiber 1 diameter coupling, and anterior barrel dliameter is beneficial to optical fiber 1 input and output light signal greater than light signal 2 diameters.Reflective graphics generates the barrel dliameter and core body 6 couplings of the cap tube 10 of cap 3.Core body 6 is a heatproof nylon cylinder.

In the illustrated example, core body 6 is affixed with the spiral inner termination of torsion spring 4, and the external end head of torsion spring 4 is directly fixed on the diapire of housing 7.

Fig. 1 middle shell 7 dots.Housing 7 can be set up jointly by box body, lid seal buckle as shown in Figure 6.The conducting-heat elements 5 of metal material is a rectangular plate shape among the figure, and there is the perforation 11 of sensor core 6 below, and the top is extended to outside the housing 7 by the roof of seal casinghousing 7, directly contacts with thermal measurement point, so that quick conductive.

Principle of work of the present utility model is: light signal generates diaphragm 2 outputs through optical fiber 1 by semicircular reflected light figure, pass reflective graphics and generate on the reflecting surface 8 that cap 3 projects core body 6 and be reflected, generate by the reflected light figure again that diaphragm 2 is gathered after optical fiber 1 output.During work, conducting-heat elements 5 directly contacts with testee measured object is carried out temperature sampling, then heat is conducted in the housing, torsion spring 4 temperature distortions, drive core body 6 affixed and reflective graphics and generate cap 3 rotations with it, the relative position that reflective graphics generates between cap 3 and the reflected light figure generation diaphragm 2 changes, linear change takes place according to the two spatial position change in the reflected light signal in the optical fiber 1 on a large scale, utilize coupling mechanism to handle, just can reflect dut temperature accurately and reliably with the reflected light signal taking-up and through opto-electronic conversion.

Claims

1. reflecting light modulation type temperature sensor, it is characterized in that be provided with optical fiber [1], reflected light figure generation diaphragm [2] in the formation, reflective graphics generates cap [3], torsion spring [4], conducting-heat elements [5], core body [6] and housing [7], its all parts all are sealed in the housing, wherein:

Optical fiber [1] and core body [6] are coaxial to be flat in the housing [7], the reflected light figure generates diaphragm [2] and lays respectively at optical fiber [a 1] end relative with core body [6] with reflective graphics generation cap [3], the other end of optical fiber [1] extends to outside the housing [7], core body [6] connects torsion spring [4], and the other end of torsion spring and housing [7] are affixed; Described conducting-heat elements [5] is arranged at torsion spring [4] one sides, the reflected light figure generates diaphragm [2] and reflective graphics generation cap [3] is equipped with the semicircle light hole, the end face of core body [6] is reflectance coating [8], the axis coinciding of the center of circle of reflectance coating and optical fiber [1], the other end of core body [6] is supported on the housing sidewall.

2. reflecting light modulation type temperature sensor according to claim 1 is characterized in that, described reflected light figure generates diaphragm [2] and reflective graphics generation cap [3] is fixed on optical fiber [1] or the core body [6] by cap tube [9], [10] respectively.

3. reflecting light modulation type temperature sensor according to claim 1 and 2 is characterized in that the upper end of described conducting-heat elements [5] extends to outside the housing [7].