Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1980-03-03
1982-05-11
Punter, William H.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
350162SF, 350174, G01B 902, G02B 2710
Patent
active
043290590
ABSTRACT:
A filter and beam combiner is comprised of a small glass plate having a microscopic two sided elliptical mirror on one side thereof. The signal beam is spatially filtered on one side of the mirror and then directed to a target. On the other side of the mirror there is a compensating glass plate through which the reference beam passes, to correct for refraction relative to its passing through the first plate, before it enters the other glass plate and is directed onto said other side. The reference beam is spatially filtered by the mirror for combination with the signal beam, which returns from the target substantially enlarged by diffraction so as to pass around the mirror and through the plate to be combined with the reference beam.
The signal beam is passed through acousto-optic modulator (AOM). The reference beam is passed through an 81 MHz AOM. The AOM's produce a doppler shift of the coherent light source frequency as the light is diffracted by a moving sound wave in the modulator. When the two beams are combined, the fringe position is proportional to the phase of the 1 MHz frequency modulation difference frequency.
The signal beam and the reference beam are combined as the former passes around the mirror and the latter is reflected thereby, forming a composite beam to form interference patterns, and from which can be extracted, with extremely high resolution, information concerning the physical characteristics of the target.
REFERENCES:
patent: 2997841 (1961-04-01), Kaufmann et al.
patent: 3225644 (1965-12-01), Schuch
patent: 3359851 (1967-12-01), Lipschutz et al.
patent: 3359852 (1967-12-01), Wilczynski et al.
patent: 3458259 (1969-07-01), Bagley et al.
patent: 3523735 (1970-08-01), Taylor
patent: 3767307 (1973-10-01), Bowker
patent: 3780217 (1973-12-01), Sawatari
patent: 3788746 (1974-01-01), Baldwin et al.
patent: 3790284 (1974-02-01), Baldwin
patent: 3877813 (1975-04-01), Hayes et al.
patent: 3938889 (1976-02-01), McKinnis
patent: 3970389 (1976-07-01), Mendrin et al.
patent: 4005936 (1977-01-01), Redman et al.
patent: 4018531 (1977-04-01), Leendertz
patent: 4105336 (1978-08-01), Pond
patent: 4165182 (1979-08-01), Vilkomerson
Pond et al., "Multiple Channel Interferometer for Metrology" App. Optics, 9-1971, pp. 2144-2149.
Pond Charles R.
Texeira Patrick D.
Wilbert Reynold E.
Barnard Delbert J.
Heberer Eugene O.
Pauly Joan H.
Punter William H.
The Boeing Company
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