Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1982-03-12
1984-07-31
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250231SE, 250349, G01D 540
Patent
active
044632592
ABSTRACT:
The invention provides a method of measuring comprising: directing sources of electro-magnetic radiation, having a predetermined displacement relative to each other in a direction of measurement, to radiate over the receiving areas of electromagnetic radiation sensors also having a predetermined displacement relative to each other in a direction of measurement; sequentially switching the sources; moving a mark between the sources and the sensors, the mark causing a restriction in a cross-section measurement of the radiation passing beyond it, and the mark moving in a direction of measurement from a reference position to a position determined by the measurement being taken; detecting any changes in the sensors as a result of movement of the radiation restriction caused by movement of the mark and the switching of the sources; noting between the switching of which sources each such change occurred; and ascertaining what distance the radiation restriction moved to cause the change to occur between the noted sources.
REFERENCES:
patent: 3255357 (1966-06-01), Kapany et al.
patent: 4101882 (1978-07-01), Kramer
J. J. Hamrick and B. E. Wendling, "Optical Displacement Measuring Device", IBM Technical Disclosure Bulletin, vol. 4, No. 7, (Dec. 1961), p. 85.
Roulston James B.
Webster Peter-John
Hannaher Constantine
Howell Janice A.
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