Linear position sensor with equalizing means

Details Linear position sensor with equalizing means Linear position sensor with equalizing means

1992-03-02

1993-02-02

Look, Edward K.

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

91 1, 91DIG4, 324635, F01B 2526, G01N 2200

Patent

active

051829797

ABSTRACT:
An apparatus is adapted to detect the linear extension, velocity and acceleration of a hydraulic cylinder. The hydraulic cylinder defines a variable length coaxial resonant cavity. Under the control of a controller, an RF transmitting section and an RF receiving section are used to determine the resonant frequency of the cavity. The receiving section includes an equalizer circuit for compensating for the insertion losses of the hydraulic cylinder. The linear extension of the cylinder is determined as a function of the resonant frequency.

REFERENCES:
patent: 2520604 (1950-08-01), Linder
patent: 3589177 (1971-06-01), Merlo
patent: 3726191 (1973-04-01), Johnston et al.
patent: 4365503 (1982-12-01), Ho et al.
patent: 4588953 (1986-05-01), Krage
patent: 4689553 (1987-08-01), Haddox
patent: 4737705 (1988-04-01), Bitar et al.
patent: 4757745 (1988-07-01), Taplin
patent: 4901628 (1990-02-01), Krage
patent: 4987823 (1991-01-01), Taplin et al.

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