Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1989-02-21
1990-09-04
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
32420724, G01B 714
Patent
active
049547763
ABSTRACT:
A linear displacement transducer comprises a winding, a magnetic core which is linearly displaceable relatively to the winding, and a source for energizing the winding with a constant RMS alternating current at a frequency sufficiently high for the resistive losses in the magnetic core to cause the voltage across the winding to vary substantially linearly relative to the linear displacement of the magnetic core. The frequency may, for example, be in the range 10 to 20 kHz, and a temperature sensing winding may be associated with the winding to enable the output from the transducer to be compensated for temperature changes, or the winding may be used in time-division multiplex for this purpose.
REFERENCES:
patent: 3651398 (1972-03-01), Urmenyi
patent: 3654549 (1972-04-01), Maurer et al.
patent: 3891918 (1975-06-01), Ellis
patent: 4042876 (1971-08-01), Visioli, Jr.
patent: 4115923 (1978-09-01), Smith et al.
patent: 4284961 (1981-08-01), Landau
"Transducer Technology . . . The Journal for the Measurement and Systems Engineer", Apr. 1989, pp. 11-13.
Edmonds Warren S.
Eisenzopf Reinhard J.
Eslinger Lewis H.
Maioli Jay H.
Penny & Giles Controls Limited
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