Motion sensing apparatus with variable threshhold

Details Motion sensing apparatus with variable threshhold Motion sensing apparatus with variable threshhold

G - Physics

01

P

340/148.2

G01P 13/00 (2006.01) G01P 15/093 (2006.01)

Patent

CA 1159128

ABSTRACT Motion sensing apparatus comprises a mercury globule supported on an opaque concave surface having a transparent window at its lowest part. A photocell is exposed to light passing through the window as it is varied by movement of the mercury. The photocell output is passed to one terminal of a comparator, the other terminal of which is energized through a variable resistor by means of which the sensitivity of the comparator to the photocell input may be varied. The comparator output controls pulse generating apparatus which produces output pulses of controllable length or, alternatively, an electronically latched continuous output either of which may control mechanism of any kind.

358715

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