Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-12-20
1988-11-08
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
374 7, G08B 2100
Patent
active
047836474
ABSTRACT:
A scanning system including a source mounted on one side of a moving web and a detector on the other, and means for monitoring changes in the air temperature in the air gaps between the moving web and, respectively, the sensor and detector. The monitoring means comprises a thin sheet of a relatively opaque and inert material having a low thermal capacity and a low thermal conductivity, mounted closely adjacent one of the gaps and a thermopile mounted on the side of the sheet away from the gap for sensing the temperature of the sheet.
In preferred embodiments in which the sheet is black polyester (e.g., "Mylar"), a sheet and thermopile are mounted on each of the sensor and detector housings, each sheet is mounted essentially coplanar with the inner side of the guide plate defining a respective air gap, and the respective thermopile is mounted on the side of its associated sheet opposite the gap.
REFERENCES:
patent: 3756524 (1973-09-01), Felix
"Motion Detection", Western Electric Tehnical Digest, No. 16, Oct. 1969.
Commercial Brochure and Technical Note for Temperature Sensor Mfd. by Measurex Corp., 1985.
Aeonic Systems, Inc.
Mullen Jr. Thomas J.
Swann III Glen R.
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