CN85102177A - Pressure sensor by stress birefraction - Google Patents
Pressure sensor by stress birefraction Download PDFInfo
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- CN85102177A CN85102177A CN 85102177 CN85102177A CN85102177A CN 85102177 A CN85102177 A CN 85102177A CN 85102177 CN85102177 CN 85102177 CN 85102177 A CN85102177 A CN 85102177A CN 85102177 A CN85102177 A CN 85102177A
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- pressure
- light
- stress
- birefraction
- pressure sensor
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Abstract
A kind of pressure sensor by stress birefraction, finish the conversion of pressure one electric weight with optical system, thereby solved the problem that piezoelectric transducer is unsuitable for static measurement, have simultaneously and the same high Frequency Response of piezoelectric sensor, in the pressure survey applicable to low, medium and high pressure.
Description
The invention belongs to the non-electrical quantity measurement technology field
At present, in dynamic pressure measurement, the piezoelectric pressure indicator with high-frequency response occupies very consequence.But it also is not suitable in static and the quasi-static measuring condition.On the other hand, very high in the structure of piezoelectric transformer and in the input circuit of secondary instrument to the insulating resistance value requirement, and require also higher to amplifying circuit.The present invention is on the basis that keeps piezoelectric transducer high-frequency features of response, satisfies a kind of pressure sensor by stress birefraction that quasistatic and static pressure are measured simultaneously.
Fig. 1 is that stress birefrin pressure passes the structural drawing of annotating device, and Fig. 2 is its light path arrangement, (1)-incident light transmitting fiber among Fig. 1,2, (2)-and light transmitting fiber end cover, (3)-sensor body, (4)-polarizer, (5)-and birefringence body, (6)-outgoing light transmitting fiber, (7)-pressure-bearing body, (8)-and pad, (9)-seal membrane, (10)-housing screw, (11)-incandescent light source, (12)-and lens combination, (13)-light shield, (14)-light activated element.
It is to utilize optical system to finish the conversion of pressure-electric weight that the present invention mainly puts.The present invention is by polarizer, birefringence body, light activated element, and parts such as light transmitting fiber and pressure-bearing body constitute.The birefringence body that places the pairwise orthogonal polarizer middle is crossed in the light beam transmission that the present invention is introduced by the incident light transmitting fiber, by the outgoing light transmitting fiber light beam is caused light activated element again.Pressure signal acts on birefringence body through the pressure-bearing body, changes the variation of intensity of polarization light into by polarizer, light activated element changes this intensity variation into electric signal, and this has just constituted a pressure sensor by stress birefraction that is used for gaging pressure.Its principle of work is: some isotropic material just changes anisotropic material in the masterpiece time spent that is subjected to a definite direction, and shows birefringence.The present invention with one block-shaped be that hexahedron (wherein regular hexahedron the best) birefringence body (birefringence body useable glass, or quartz glass, or material such as epoxy resin is made) is by the acting body of measuring pressure.With lens combination (as Fig. 2) the light beam focusing back that the ordinary incandescent lamp light source is produced is positioned at the polarizer of birefringence body one side by the introducing of incident light transmitting fiber, and makes this light beam pass through this birefringence body along direction perpendicular to the pressure effect.So two principal refractive index n on the light ray propagation direction
eAnd n
1
n
e-n
1＝C.P
C is a constant in the formula.
The difference of two principal refractive indexs is with there being following relation between the optical path difference δ:
δ＝C·P·h
H is the length of birefringence body on the printing opacity direction in the formula.
For light path this and that acting force is linear is shown, the present invention has arranged the polarizer of quadrature again in the birefringence body both sides, polarizer can be used crystallite dichromatism type polaroid sheet, the glass pile that molecule dichromatism type polaroid sheet or thin glass are constituted.Polaroid can be bonded on two sides of birefringence body with agent of polyurethane jelly or modified phenolic adhesive, and two polaroid phase quadratures, and the light intensity of being introduced by light transmitting fiber is I like this
0Its transmitted light intensity of light beam can be expressed as the function of pressure P.
I＝I
0sin
2（ (π)/(λ) C·P·h）
Pressure acts on birefringence body by the pressure-bearing body.When pressure changes, transmitted intensity is corresponding to change, and this light beam that has changed light intensity reaches light activated element (but light activated element silicon photocell again by the polarizer of stress two-fold body opposite side by light transmitting fiber, photoelectric tube, photoresistance or photistor), light activated element will be experienced the variation of this light intensity, with its transformation, for electric signal at last by by secondary instrument, as voltage amplifier oscillograph etc., carry out signal Processing, and show and note.
Since adopted with piezoelectric transformer in same silica glass material as the pressure conversion body so the consistent of elastic modulus guaranteed that they have same high frequency response characteristic, and the characteristic of this sensor itself is to high frequency, low frequency and static be consistent with quasistatic.With epoxy resin as pressure converter, it is highly sensitive in the pressure conversion body of quartz material, can be used in the less demanding measurement of frequency response, and the present invention mainly is made of optical element, so be not subjected to, the influence of external interference such as magnetic field, and highly sensitive, can under the condition that does not add prime amplifier, work, the present invention is simple in structure, volume is little, in the pressure survey applicable to low, medium and high pressure.
Pressure sensor by stress birefraction embodiment
Birefringence body is that a shape is the quartz glass (6) of regular hexahedron (length * wide * thick=4 * 4 * 3 millimeter), with polyurethane adhesive two molecule dichromatism type polaroids (4) is sticked on glass two sides orthogonally along direction of beam propagation.
Light transmitting fiber (1), (6) diameter is 2 millimeters, long 1 meter, end cover (2) with its end is fixed on the sensor body (3), T shape pressure-bearing body one end and glass contact, diameter is 6 millimeters, other end diameter can be selected between 2～5 millimeters, change this diameter dimension and then can change and act on power on glass, thereby changed the range of gaging pressure.The compacted screw of thick 0.1 millimeter seal membrane (10) is pressed against on the pad (9), and its effect is that sealing is by measuring pressure.The end cover, the pressure-bearing body, seal membrane and pad are all made with stainless steel.
The fibre-optic other end of outgoing contacts with 4 * 4 millimeters silicon photocells (14).Light shield (13) is to be provided with in order to prevent extraneous veiling glare from disturbing.
What light source (11) adopted is the higher small-sized tungsten iodine lamp bulb of light intensity.Experiment shows by the measuring voltage value of silicon photocell output just can be measured by electron oscillograph under the situation that does not add amplifier, amplify and signal Processing after then can obtain bigger power and export.
Fig. 3 is the present embodiment calibration curve.A, B among the figure, C are respectively at the incident intensity I of Datong District
0Value.Ordinate is the magnitude of voltage without amplification and signal Processing of silicon photocell output.Horizontal ordinate is the force value that acts on the sensor.The present embodiment measurement range is: 0～70 kilograms per centimeter.
Claims (5)
1, a kind of pressure sensor by stress birefraction, it is characterized in that it is by light transmitting fiber, polarizer, the pressure-bearing body, birefringence body and light activated element constitute, cross the birefringence body (5) that places pairwise orthogonal polarizer (4) middle by the light beam transmission that incident light transmitting fiber (1) is introduced, by outgoing light transmitting fiber (6) light beam is caused light activated element (14) again, pressure signal acts on birefringence body through pressure-bearing body (7), change the variation of intensity of polarization light into by polarizer, light activated element changes this intensity variation into electric signal.
2,, it is characterized in that described birefringence body is by glass or quartz glass or the made hexahedron of epoxide resin material according to the described pressure sensor by stress birefraction of claim 1.
3,, it is characterized in that described light activated element is a silicon photocell according to the described pressure sensor by stress birefraction of claim 1; Photoelectric tube; Photoresistance or photistor.
4,, it is characterized in that described polarizer is a crystallite dichromatism type polaroid sheet according to the described pressure sensor by stress birefraction of claim 1; The glass pile that molecule dichromatism type polaroid sheet or thin glass are constituted.
5, according to the described hexahedron of claim 2, it is characterized in that regular hexahedron the best.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85102177 CN85102177A (en) | 1985-04-01 | 1985-04-01 | Pressure sensor by stress birefraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85102177 CN85102177A (en) | 1985-04-01 | 1985-04-01 | Pressure sensor by stress birefraction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85102177A true CN85102177A (en) | 1986-03-10 |
Family
ID=4792310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85102177 Pending CN85102177A (en) | 1985-04-01 | 1985-04-01 | Pressure sensor by stress birefraction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85102177A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035344C (en) * | 1992-09-05 | 1997-07-02 | 陈庆全 | Polarizing direct current optical fibre sensor compensation method |
-
1985
- 1985-04-01 CN CN 85102177 patent/CN85102177A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035344C (en) * | 1992-09-05 | 1997-07-02 | 陈庆全 | Polarizing direct current optical fibre sensor compensation method |
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| WD01 | Invention patent application deemed withdrawn after publication |