Material characteristics measuring methods and devices

Details Material characteristics measuring methods and devices Material characteristics measuring methods and devices

1986-08-21

1988-02-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

372 29, 372 31, 372 32, H01S 313

Patent

active

047243147

ABSTRACT:
Radiation from coupled-cavity lasers is used to measure certain characteristics of materials, e.g., absorption, reflectance and other complex dielectric constants of solids, liquids and gases. Novel laser systems with electronic feedback loops are disclosed which provide compensation for laser changes with moderate temperature variations resulting in improved measurement accuracy without adversely affecting system power efficiency. In a preferred embodiment, the invention is used in the measurement of optical attenuance in submarine water over long path-lengths and at relatively specific wavelengths, e.g., about 800 nm.

REFERENCES:
patent: 4092530 (1978-05-01), Wise
patent: 4369525 (1983-01-01), Breton et al.
patent: 4410992 (1983-10-01), Javan
patent: 4632552 (1986-12-01), Olsson et al.
patent: 4677632 (1987-06-01), Lisco et al.

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