GB1476554A - Piezo-optical measuring transducers - Google Patents
Piezo-optical measuring transducersInfo
- Publication number
- GB1476554A GB1476554A GB2100975A GB2100975A GB1476554A GB 1476554 A GB1476554 A GB 1476554A GB 2100975 A GB2100975 A GB 2100975A GB 2100975 A GB2100975 A GB 2100975A GB 1476554 A GB1476554 A GB 1476554A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- optical
- light
- photodiodes
- intensity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 abstract 5
- 230000035945 sensitivity Effects 0.000 abstract 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 238000005452 bending Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 238000007907 direct compression Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000010445 mica Substances 0.000 abstract 1
- 229910052618 mica group Inorganic materials 0.000 abstract 1
- 230000007935 neutral effect Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
- 239000005368 silicate glass Substances 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/241—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet by photoelastic stress analysis
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
1476554 Piezo-optical transducers MOSKOV GOSUDARSTVENNY UNIVERSITET IM MV LOMONOSOVA 16 May 1975 21009/75 Heading G1A A Piezo-optical transducer, Fig. 11, comprises a polarizer 84, an elastic element 78 of silicate glass or of a single crystal which varies its optical anisotropy with mechanical stress, a phase-shifting plate 85, an analyzer 86 and silicon photodiodes 87 and 89 electrically connected in a differential relationship, the optical arrangement providing that variations in the intensity of the light falling on the two photodiodes caused by the applied stress are of opposite polarity. The principle of operation is that the element 78 polarizes each light beam in two mutually perpendicular planes and produces a phase difference between the two polarized components due to the difference in refractive index of the element 78 along the two planes. The portions of the polarized components passed by the analyzer 86 interfere and produce a variation in the intensity of the light falling on the photodiodes. This intensity varies sinusoidally with the phase difference Fig. 31 (not shown), and the phase-shifting plate 85 of a birefringent material such as mica is used to bring the working point of the optical channels to the portion of the sinusoid (ac) having maximum slope and linearity. In the embodiment of Fig. 11 the element 78 is subjected to bending stress and the required opposite polarities of the light intensity variations are produced by the two light beams 83, 88 passing on opposite sides of the neutral axis 90. In the embodiment of Fig. 2 the element 4 is subjected to direct compression and the required opposite polarities are produced by having a separate phaseshifting plate 8, 9 for each light beam, the thickness of plate 9 being sufficiently greater than plate 8 to shift the phase difference for beam 15 by an additional amount #. Alternatively the phaseshifting plates may have the same thickness but be arranged so that the axes of maximum and minimum velocities F and S of one plate are normal to respective axes of the other plate, Figs. 3, 4, 5 (not shown). In a still further variation, Figs. 6, 7, 8, 9 (not shown), the plates are of the same thickness and optical alignment but the polarization planes of the polarizer and analyzer are parallel in one channel and perpendicular in the other. For better sensitivity an additional pair of optical channels may be provided (Fig. 9) having additional photodiodes 75, 76, Fig. 14, wherein F.E.T.'s 96, 97 form a differential follower, the gallium arsenide light sources 58-61 are connected in series to power supply terminals 101 and resistors 98-100 serve for zeroing the output signal at zero force. A sensitivity stabilizing circuit Fig. 18 (not shown) comprises a controlled power supply (106) connected to the light source (1) or sources, a Zener diode reference circuit (105), a comparison circuit (104) and adder potentiometer (103). Compensation for temperature drift in the zero output signal is provided by a resistive circuit (118) in which a compensating signal derived from a potentiometer (119) connected in the supply line to the light source is applied to the transducer output terminals (102) via a further potentiometer (120) and resistors (121, 122). Accelerometers Figs. 19-22 (not shown), pressure gauges Figs. 23-25 (not shown), load cells Figs. 26-29 (not shown), and a thermometer Fig. 30 (not shown), embodying the invention are described.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2100975A GB1476554A (en) | 1975-05-16 | 1975-05-16 | Piezo-optical measuring transducers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2100975A GB1476554A (en) | 1975-05-16 | 1975-05-16 | Piezo-optical measuring transducers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1476554A true GB1476554A (en) | 1977-06-16 |
Family
ID=10155641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2100975A Expired GB1476554A (en) | 1975-05-16 | 1975-05-16 | Piezo-optical measuring transducers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1476554A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2491212A1 (en) * | 1980-09-26 | 1982-04-02 | United Technologies Corp | DIGITAL COMPATIBLE OPTICAL PRESSURE MEASURING APPARATUS |
GB2205398A (en) * | 1987-05-23 | 1988-12-07 | Rheinmetall Gmbh | Measuring acceleration |
GB2223094A (en) * | 1988-09-24 | 1990-03-28 | Dobson Park Ind | Pressure transducer |
CN101251427B (en) * | 2008-03-28 | 2011-06-08 | 苏州光环科技有限公司 | Complete optical fiber polarization type pressure measurement method and sensing device |
-
1975
- 1975-05-16 GB GB2100975A patent/GB1476554A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2491212A1 (en) * | 1980-09-26 | 1982-04-02 | United Technologies Corp | DIGITAL COMPATIBLE OPTICAL PRESSURE MEASURING APPARATUS |
GB2205398A (en) * | 1987-05-23 | 1988-12-07 | Rheinmetall Gmbh | Measuring acceleration |
GB2223094A (en) * | 1988-09-24 | 1990-03-28 | Dobson Park Ind | Pressure transducer |
CN101251427B (en) * | 2008-03-28 | 2011-06-08 | 苏州光环科技有限公司 | Complete optical fiber polarization type pressure measurement method and sensing device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |