Optical system for infrared spectroscopy having an aspherical co

Details Optical system for infrared spectroscopy having an aspherical co Optical system for infrared spectroscopy having an aspherical co

1994-10-24

1996-01-09

Gonzalez, Frank

Optics: measuring and testing

Of light reflection

356446, 356244, G01N 2155, G01N 2101

Patent

active

054833507

ABSTRACT:
An optical system for a high-sensitivity reflectivity measurement equipment having a simple structure enhances the light utilization efficiency and simplifies the production process and reduces the cost.
An aspherical concave mirror with a predetermined range opened at the central portion and one focal point set on the outside of the end surface of the opening is used. The region width of the mirror surface measured from the plane the opening is so determined that the incident light from a proper light source and reflected by the mirror surface to enters the sample placed at the focal point at an incident angle .theta. where 60.degree..ltoreq..theta.<90.degree.. The incident light is reflected by the aspherical concave mirror and the sample surface and again by the aspherical concave mirror so as to become outgoing light for detection. Thus, appropriate and efficient incidence of light to the sample is enabled by a very simple structure having the aspherical concave mirror as the main element. High utilization of effective light is enabled and the detection accuracy is enhanced.

REFERENCES:
patent: 4479058 (1984-10-01), Gast et al.
patent: 4747684 (1988-05-01), Weiser
patent: 5019715 (1991-05-01), Sting et al.
patent: 5035863 (1991-07-01), Finlan et al.
patent: 5064619 (1991-11-01), Finlan
patent: 5093580 (1992-03-01), Sting
patent: 5106196 (1992-04-01), Brierley
patent: 5392175 (1995-02-01), Reisser

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