Optics: measuring and testing – Photometers – Photoelectric
Patent
1977-12-12
1979-05-08
Hille, Rolf G.
Optics: measuring and testing
Photometers
Photoelectric
356222, 250578, G01J 142
Patent
active
041533682
ABSTRACT:
A protection device for an electro-optical detector used in systems for making far field diagnostic measurements of a high energy laser beam comprises a solid silicon cone having a truncated apex which functions as the pin hole aperture for the detector. The large end of the cone has a surface defined by the radius drawn from the cone axis at the truncation. This surface is coated with a reflective attenuation layer which reflects a high percentage of the energy of the incident laser beam entering the pinhole aperture thereby minimizing the absorption of the beam by the cone. The high index of refraction of the solid silicon cone permits large off-axis angles of the laser beam to be directed onto the detector resultingly increasing the field of view of a system using a given detector. The increased field of view allows a closer spacing of a plurality of detectors in the system ensuring a high spatial resolution of the laser beam for a desired field of view.
REFERENCES:
patent: 3152215 (1964-10-01), Barstow et al.
patent: 3648056 (1972-03-01), Buttweiller et al.
patent: 3693515 (1972-09-01), Baker
patent: 3850525 (1974-11-01), Kaye
patent: 3931593 (1976-01-01), Marshall
patent: 4035088 (1977-07-01), Jenkins et al.
patent: 4059359 (1977-11-01), Foster et al.
R. A. Walker "Optical Systems for Defining the Viewing . . . " Applied Ops, vol. 11, No. 9, Sep. 1972, pp. 2060-2068.
Falbel Gerald
Spangenberg Peter E.
Beers R.
Hille Rolf G.
Sciascia R.
Sheinbein S.
The United States of America as represented by the Secretary of
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