Distance measuring arrangements

Details Distance measuring arrangements Distance measuring arrangements

1977-12-05

1979-04-17

Gill, James J.

Measuring and testing

Speed, velocity, or acceleration

With distance registering means

73517R, G01C 2116, G01P 1502

Patent

active

041494172

ABSTRACT:
A distance measuring arrangement has an accelerometer transducer of the force balance type in which a switch closed by the action of an acceleration force causes a constant current to flow in a coil to oppose the force and open the switch. The switch opens and closes in a repetitive cycle at the resonant frequency of the system, the closed switch gating clock pulses to integration means. The transducer may take two forms. In the first the proportion of time that the switch is closed in each cycle is proportional to the acceleration value. Distance measurement comprises counting the clock pulses to effect a first stage of integration and summating the counter totals every 1000 clock pulses to give a distance travelled signal. In the second, the proportion of time that the switch is closed in each cycle is proportional to the square root of the acceleration value and distance measuring comprises counting the clock pulses to give a signal proportional to the square root of distance travelled. In both cases this signal may be compared with a stored predetermined value to effect a control function.

REFERENCES:
patent: 2049129 (1936-07-01), McNeil
patent: 2846207 (1958-08-01), Marggraf
patent: 2940306 (1960-06-01), Lozier
patent: 3901086 (1975-08-01), Griffiths et al.

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