Title:
METHOD AND APPARATUS FOR SPECTRUM ANALYSIS AND ENCODER
Document Type and Number:
WIPO Patent Application WO2000000796
Kind Code:
A3
Abstract:
A disc serving as a spatial radiation modulator has dispersed radiation filters thereon. Each filter has a transmittance or reflectance modulation function of the form sin<2>(m theta + p pi /4), where m is a positive integer and p has one of the four values 0, 1, 2, 3. A radiation beam including selected wavelength components is diffracted into an elongated image dispersed according to wavelength. Different wavelength components are focused onto different filters on the modulator and are encoded by corresponding filters. Since the modulation functions of the filters are orthogonal to one another, it is possible to extract the amplitude of each wavelength component after it has been encoded or modulated by corresponding filter from the total detected signal during one measurement.
Inventors:
HAGLER THOMAS W (US)
Application Number:
PCT/US1999/014446
Publication Date:
April 13, 2000
Filing Date:
June 25, 1999
Export Citation:
Assignee:
HAGLER THOMAS W (US)
International Classes:
G01J3/12; G01J3/32; G01J3/433; G01J3/28; (IPC1-7): G01J3/12; G01J3/32; G01J3/433
Domestic Patent References:
| WO1997031245A1 | 1997-08-28 |
Foreign References:
| US5485268A | 1996-01-16 | |||
| US3922092A | 1975-11-25 | |||
| GB672758A | 1952-05-28 |
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