Three dimensional imaging device

Details Three dimensional imaging device Three dimensional imaging device

1985-04-30

1987-02-24

LaRoche, Eugene R.

Optics: measuring and testing

By polarized light examination

With light attenuation

250201, G01B 1124

Patent

active

046453474

ABSTRACT:
An imaging device employs a known bidimensional, position sensitive light detector of the CCD type. A converging lens system images points on a target surface onto the detector to generate data on the X and Y coordinates of each point. The invention is characterized by a mask located in the aperture plane of the lens system. This mask either has a pair of spaced apart, separate, circular apertures or an annular aperture symmetrical about the optical axis. In the first instance, the result is to form spaced-apart dots on the detector for each point of the target surface, the distance between these dots being a measure of the Z coordinate of the respective point. When using the annular aperture, rings are formed on the detector, the ring diameter representing the Z data. The arrangement provides a compact and robust device for obtaining three dimensional data on a target surface.

REFERENCES:
patent: 3589815 (1971-06-01), Hosterman
patent: 3912922 (1975-10-01), Lacotte et al.
patent: 4009386 (1977-02-01), Deml et al.
patent: 4074104 (1978-02-01), Fulkerson
patent: 4176160 (1979-10-01), Ernst
patent: 4329060 (1982-05-01), Wilder
patent: 4548504 (1985-10-01), Morander
3-D Inspection Using Multi-Stripe Structured Light, Case et al., Cyber Optics Co., Mar. 1985.

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