Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1980-03-13
1983-03-08
Punter, William H.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
250560, 356243, G01B 1106, G01V 102, G01D 1800
Patent
active
043759211
ABSTRACT:
A device for accurately measuring a dimension associated with a remote object without contacting the object itself is disclosed. A beam of light is directed at a surface of the object and a reflected portion of the beam is detected at a photodetector element. The particular dimension of the object is determined mathematically by measuring the distance by which the reflected light signal is offset from a predetermined point on the photodetector which is aligned with a reference plane at the object. By the use of two heads and respective light beams and photodetectors, a remote object's thickness can also be measured.
In order to compensate for the angular relationship between the object's surface and that of the photodetector, a linearizing calibration circuit is included in which preset corrections are recorded in programmable memory units. The calibration settings are determined during manufacture and correct for each normally non-linear reading at incremental distances within a prescribed measurement range. Further accuracy of the system is obtained by using a high frequency sampling circuit to modulate the light source, with a demodulating circuit serving to discriminate between the input light beam and extraneous ambient light signals.
REFERENCES:
patent: 3289298 (1966-12-01), Standridge
patent: 3393600 (1968-07-01), Bess
patent: 3565531 (1971-02-01), Kane et al.
patent: 3646331 (1972-02-01), Lord
patent: 3819940 (1974-06-01), Laws
patent: 3950096 (1976-04-01), Aeschlimann et al.
patent: 4040738 (1977-08-01), Wagner
patent: 4103177 (1978-07-01), Sanford et al.
patent: 4225245 (1980-09-01), Roiret et al.
Poulos et al., "Calibration Fixture for Green Ceramic Sheet Thickness Sensor", IBM Tech. Disclosure Bull., 4-1977, p. 4162.
Punter William H.
Selective Electronic Co. AB
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