Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1977-01-06
1978-09-12
Smith, Alfred E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
333 70CR, 346 33A, G01J 342, G01D 900, H03H 710
Patent
active
041133854
ABSTRACT:
There is described an improvement for an apparatus employing a plurality of operational elements adapted to cooperate for producing an electrical signal representing the variation of an ordinate quantity with respect to an abscissa quantity changing at a controlled rate. At least one of said elements requires an adjustment during operation such as is capable of causing spurious transients in the electrical signal. The apparatus further comprises a filter for filtering the electrical signal before feeding the signal to a suitable utilization device such as a recorder. The improvement includes control means which operate to interrupt the ordinate quantity signal and cut off the filter response prior to any element adjustment. There is disclosed means for storing the output of the filter at cut off and for memorizing the point along the impulse characteristic of the filter at which cut off takes place. There is further disclosed means for sensing the completion of the element adjustment and for applying a predetermined time delay before the reinstatement of system operation. This eliminates the effect of transients at this point.
REFERENCES:
patent: 3537797 (1970-11-01), Matthews
patent: 3843259 (1974-10-01), Tohyama et al.
patent: 3930727 (1976-01-01), Vergato
patent: 3995207 (1976-11-01), Way
Ford Michael Alan
Kolb Dieter
Mould Henry Manifold
Barlow Harry
Crane John D.
Giarratana Salvatore A.
Masselle Francis L.
Smith Alfred E.
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