Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1985-03-05
1987-03-24
Ruehl, Charles A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73778, 7386259, 250227, 34087028, G01B 716, G01L 110
Patent
active
046515712
ABSTRACT:
A strain sensor includes a quartz crystal element 9 having a resonant frequency which is dependent on strain imposed on it. The crystal element 9 is caused to vibrate at its resonant frequency by pulses of light transmitted along an optical fibre 5 from a remote location indicated generally at 1. A signal produced by the vibration at the resonant frequency is taken from electrodes 10 and 12 and amplified at 13 and 14 before being used to switch on and off a switch 15 controlling a light source 16. The output from the light source 16, consisting of flashes of light of a frequency indicative of the strain, is transmitted along a second optical fibre 19 and is detected by a photocell 20. The frequency of the output of photocell 20 is measured at 21 to give the desired measurement of strain and to provide feedback to the drive unit 3 which determines the frequency of the flashes of light produced at 2.
REFERENCES:
patent: 3619612 (1971-11-01), Belke
patent: 4417140 (1983-11-01), Adolfsson et al.
patent: 4435986 (1984-03-01), Choffat
patent: 4490606 (1984-12-01), Lockett et al.
patent: 4525874 (1985-06-01), Baues
Fisher Controls International Inc.
Ruehl Charles A.
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