Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1986-12-10
1988-05-17
Willis, Davis L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
350 9611, G01B 902
Patent
active
047446617
ABSTRACT:
A device for measuring small distances, provided with a sensing tip mounted to be movable in the direction of the length to be measured, a transducer for converting the movements of the sensing tip into corresponding electric signals, and indicating means to indicate such signals. The transducer comprises an optical interferometer provided with a measuring waveguide. One end of the waveguide is connected to a laser and the other end to optical means for directing the light onto a measuring mirror disposed at a distance. The light is reflected by the mirror back to the optical means. The measuring mirror is connected to the sensing tip. The interferometer further includes a reference waveguide linked to the measuring waveguide. The reference waveguide has a mirror disposed at one end and a photoelectric transduer at the other end. The transducer is connected to the indicating means for indicating the output signals of the transducer. The device permits a cost-effective and uncomplicated construction as an integrated unit. The device affords precision measurements at accuracies in the range of one half of the wavelength of the lasr beam, or even far below such a value. The device also exhibits a high linearity for substantially greater distances. The device is also suitable for measuring extremely rapid changes in length while using a small bearing pressure on the sensing tip.
REFERENCES:
patent: 3472597 (1969-10-01), Whitten, Jr.
patent: 3837728 (1974-09-01), Logan et al.
patent: 4120588 (1978-10-01), Chaum
patent: 4538911 (1985-09-01), Heynacher et al.
Hutter Karl
Ulbers Gerd
Hommelwerke GmbH
Koren Matthew W.
Willis Davis L.
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