Fresnel lens based spectroscopic detector

Details Fresnel lens based spectroscopic detector Fresnel lens based spectroscopic detector

1991-06-18

1993-05-18

Rosenberger, Richard A.

Optics: measuring and testing

By dispersed light spectroscopy

G01J 300

Patent

active

052125360

ABSTRACT:
A detector for laser radiation that detects the presence of above-threshold radiation in one of a set of wavelength ranges employs a set of Fresnel lenses designed to focus radiation in a particular band onto a metal-coated film. A series of Fresnel lenses is designed with constant focal lengths, but each lens is designed to have that focal length at a specific wavelength. Only when the wavelength of the incident radiation matches the design wavelength of the Fresnel lens will the film be marked or machined. Radiation of differing wavelengths will be defocused to a degree that will reduce the intensity below the level that will mark or machine the film. An electronic based version of this spectroscopy detector can also be implemented.

REFERENCES:
patent: 4039825 (1977-08-01), Doyle
patent: 4829339 (1989-05-01), Dwyer
"Fresnel Diffraction", Fundamentals of Optics, by F. A. Jenkins, 1965.
"Coherent Laser Beam Addition: An Application of Binary-Optics Technology", The Lincoln Laboratory Journal, by F. R. Leger, M. Holz, G. J. Swanson and W. B. Veldkamp, Fall 1988, vol. 1, No. 2.

Affiliated with

Also associated with

Rating

Fresnel lens based spectroscopic detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fresnel lens based spectroscopic detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fresnel lens based spectroscopic detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-807547