ES341287A1 - Force-transducers - Google Patents
Force-transducersInfo
- Publication number
- ES341287A1 ES341287A1 ES341287A ES341287A ES341287A1 ES 341287 A1 ES341287 A1 ES 341287A1 ES 341287 A ES341287 A ES 341287A ES 341287 A ES341287 A ES 341287A ES 341287 A1 ES341287 A1 ES 341287A1
- Authority
- ES
- Spain
- Prior art keywords
- struts
- disc
- amplifier
- vibration
- pressure
- 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
- 239000003302 ferromagnetic material Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 3
- 238000012986 modification Methods 0.000 abstract 3
- 238000001514 detection method Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 230000005291 magnetic effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
- 239000010453 quartz Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
-
- 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
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
- G01L1/162—Measuring force or stress, in general using properties of piezoelectric devices using piezoelectric resonators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
- G01L9/0008—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations
- G01L9/0022—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a piezoelectric element
Abstract
A force or fluid-pressure transducer comprises two resilient struts 11, 12, Fig. 1, whose ends are connected to end-pieces 13, 14 to one of which the force is applied via rod 15 and disc 17, the other being rigid with the transducer casing 19, or having a second force applied for differential measurements. The struts are kept in vibration at a common resonance frequency which depends on the force applied and which is measured electrically to give an indication of the applied force. Construction. The interior of the casing is sealed by a diaphragm 21 and is kept either at a constant reference pressure or evacuated. In a modification, a reference pressure is introduced into a chamber formed by connecting a further disc 32, Fig. 3, via rod 33 to a disc 31 corresponding to the disc 17, the chamber being sealed by diaphragm 36, and the housing surrounding the struts 11, 12 being evacuated. In this embodiment the ratio of the area of disc 31 to that of disc 32 is made as small as possible to minimize the response of the transducer to the sum of the reference pressure and pressure to be measured. Alternatively, to eliminate this response, the end-piece 14 of the transducer is connected via rods (16, 43, Fig. 4 not shown), to a similar arrangement of discs (41), (42) defining a chamber for the reference pressure, the area of disc (42) being larger than that of disc (41) by an amount equal to the area of disc (31). In a modification of the first embodiment for measuring the difference between two pressures, an end-piece (51, Fig. 5 not shown) is connected via a rod (54) to two discs (55), (56) to which the two pressures are applied, an annular second endpiece (52) being connected to the casing (53). The struts may be rectangular in cross-section or hollow tubes, they may be straight or concave, Fig. 6 (not shown), or the struts and end-pieces may take the form of a ring, the pressure being applied across a diameter. In an alternative form the struts are formed from a hollow cylinder of ferromagnetic material in the walls of which wide longitudinal slots have been made to leave a plurality of struts. Vibration excitement and detection. In one embodiment struts of non-ferromagnetic material are connected in parallel across the output of an A. C. amplifier 25 and are situated in the D.C. magnetic field of bar magnets (23, 24, Fig.2 not shown), so that they vibrate in a traverse direction. The vibration is detected by strain gauges 26, 27, Fig. 1, whose outputs are fed via a pre-amplifier 28, a phase shift network 29 and an amplifier 25 to maintain the vibration of the struts at their resonant frequency and is measuredby a meter 30 to give an indication of the applied pressure. Alternatively the struts may be of ferromagnetic material, internal or external drive and pick-up coils being provided which are connected to amplifiers 25 and 28 respectively. Alternatively vibration of the struts and detection of the vibration may be performed by Piezoelectric plates (101-104, Fig.9 not shown), bonded to the ends of the struts, plates (101), (102) being energized by amplifier 25 and plates (103), (104) feeding pre-amplifier 28. In a modification the struts themselves are cut from a quartz Piezoelectric plate and are provided with pairs of electrodes (114-117, Fig 10 not shown), on both sides, the electrode pairs (115), (117) being connected to pre-amplifier 28 and electrode pairs (114), (116) to the amplifier 28.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB22146/66A GB1181515A (en) | 1966-05-18 | 1966-05-18 | Improvements in or relating to Force-Measuring Apparatus. |
Publications (1)
Publication Number | Publication Date |
---|---|
ES341287A1 true ES341287A1 (en) | 1968-10-01 |
Family
ID=10174646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES341287A Expired ES341287A1 (en) | 1966-05-18 | 1967-05-18 | Force-transducers |
Country Status (4)
Country | Link |
---|---|
US (1) | US3529470A (en) |
DE (1) | DE1648690C3 (en) |
ES (1) | ES341287A1 (en) |
GB (1) | GB1181515A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114563113A (en) * | 2022-03-03 | 2022-05-31 | 中国工程物理研究院总体工程研究所 | Hollow resonant stress assembly and stress meter |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4091682A (en) * | 1977-04-04 | 1978-05-30 | Sensor-Matic, Inc. | Digital differential pressure measurement apparatus |
US4419896A (en) * | 1981-08-27 | 1983-12-13 | Olson Jr Carl O | Force or vibration indicating device utilizing microwave resonance ferramic gyrators |
GB2121953B (en) * | 1982-06-10 | 1985-09-04 | Itt Ind Ltd | Improvements in transducers |
US4526247A (en) * | 1983-01-18 | 1985-07-02 | Ohaus Scale Corporation | Weighing scale transducer |
DE3382590D1 (en) * | 1983-04-01 | 1992-08-20 | Quartex Inc | DOUBLE ROD RESONATOR POWER CONVERTER WITH RESTRICTED LONGITUDINAL PUMPING EFFECT. |
GB2141231B (en) * | 1983-06-07 | 1986-08-06 | Gen Electric Co Plc | Force sensors |
JPS60127434A (en) * | 1983-12-14 | 1985-07-08 | Shimadzu Corp | Vibration type force detector |
GB2156519B (en) * | 1984-03-02 | 1987-11-04 | British Gas Corp | Vibratory wire strain gauge assemblies for underwater attachment |
DE3505165C2 (en) * | 1985-02-15 | 1986-12-04 | Danfoss A/S, Nordborg | Method and device for measuring a force |
GB2196120A (en) * | 1986-10-10 | 1988-04-20 | Gen Electric Co Plc | A resonant element force sensor in a housing affording temperature and pressure compensation |
US4872343A (en) * | 1988-08-10 | 1989-10-10 | Sundstrand Data Control, Inc. | Matched pairs of force transducers |
US4912990A (en) * | 1989-02-27 | 1990-04-03 | Sundstrand Data Control, Inc. | Magnetically driven vibrating beam force transducer |
GB2251488A (en) * | 1990-11-16 | 1992-07-08 | Pa Consulting Services | Load cell and method and apparatus for driving a system at resonance |
US5442146A (en) * | 1992-04-03 | 1995-08-15 | Weigh-Tronix, Inc. | Counting scale and load cell assembly therefor |
US5391844A (en) * | 1992-04-03 | 1995-02-21 | Weigh-Tronix Inc | Load cell |
US5313023A (en) * | 1992-04-03 | 1994-05-17 | Weigh-Tronix, Inc. | Load cell |
US5336854A (en) * | 1992-04-03 | 1994-08-09 | Weigh-Tronix, Inc. | Electronic force sensing load cell |
EP3583892A1 (en) * | 2018-06-20 | 2019-12-25 | Koninklijke Philips N.V. | Pressure sensing unit, system and method for remote pressure sensing |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2854581A (en) * | 1955-11-11 | 1958-09-30 | Ferranti Ltd | Beat frequency oscillator |
US3067615A (en) * | 1959-08-10 | 1962-12-11 | Borg Warner | Condition responsive apparatus |
US3238789A (en) * | 1961-07-14 | 1966-03-08 | Litton Systems Inc | Vibrating bar transducer |
FR1324283A (en) * | 1962-02-28 | 1963-04-19 | Manometric capsules compensating for thermal expansion |
-
1966
- 1966-05-18 GB GB22146/66A patent/GB1181515A/en not_active Expired
-
1967
- 1967-05-10 US US637471A patent/US3529470A/en not_active Expired - Lifetime
- 1967-05-17 DE DE1648690A patent/DE1648690C3/en not_active Expired
- 1967-05-18 ES ES341287A patent/ES341287A1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114563113A (en) * | 2022-03-03 | 2022-05-31 | 中国工程物理研究院总体工程研究所 | Hollow resonant stress assembly and stress meter |
CN114563113B (en) * | 2022-03-03 | 2023-11-21 | 中国工程物理研究院总体工程研究所 | Hollow resonance type stress assembly and stress meter |
Also Published As
Publication number | Publication date |
---|---|
GB1181515A (en) | 1970-02-18 |
DE1648690A1 (en) | 1971-05-27 |
DE1648690B2 (en) | 1978-01-19 |
DE1648690C3 (en) | 1978-09-28 |
US3529470A (en) | 1970-09-22 |
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