Detector for sensing and/or measuring passing objects

Details Detector for sensing and/or measuring passing objects Detector for sensing and/or measuring passing objects

1988-05-06

1989-09-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340511, 340630, 340693, G08B 1318, G08B 2900, G08B 2100

Patent

active

048664251

ABSTRACT:
A detector for sensing or measuring objects passing a measurement path (5) has a detection element (6), the output signal of which is a function of objects discovered in the measurement path. The output signal is fed to an amplifier and filter circuit (7-9), the output of which is connected to two parallel integration cirucits (11, 12). The integration circuits have time constant (.tau..sub.SH, .tau..sub.L) of different magnitudes, and their output signals are fed to a comparator (13) for obtaining an operative signal indicating the presence of an object in the measurement path, this signal being unresponsive to long-duration fluctuations in the detector's operating conditions, e.g., dirtying of the detection element. The detector includes a dirtiness alarm with the threshold response adjustable to a long-time-constant integrator output.

REFERENCES:
patent: 4266219 (1981-05-01), Foster et al.
patent: 4317113 (1982-02-01), Honma
patent: 4384280 (1983-05-01), Haag

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