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Patent Agency Ranking1.发明公开
公开(公告)号：EP0255953A3
公开(公告)日：1988-12-14
申请号：EP87111393
申请日：1987-08-06
Inventor： Calvani, Riccardo , Caponi, Renato , Cisternino, Francesco
CPC classification number: H04B10/07 , G01J4/00 , G01J9/04 , G01N21/211
Abstract: The interferometer makes use of an acousto-optic device (11, 21) to perform a frequency shift of the beam sent along one of the interferometer branches, so as to allow the determination of the state of polarization by heterodyne radiofrequency detection. The acousto-optic device can be inserted downstream the means (8) splitting the beam emitted by the source (1) into the two beams sent along the two interferometer branches, or it can also act as the beam splitter.
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公开(公告)号：EP0057568A3
公开(公告)日：1982-09-08
申请号：EP82300419
申请日：1982-01-27
Applicant: EXXON RESEARCH AND ENGINEERING COMPANY
Inventor： Kaldor, Andrew , Robinowitz, Paul , Stein, Alexander
CPC classification number: G01J5/522 , B62B13/10 , G01J5/0044 , G01J5/08 , G01J5/0806 , G01J5/0834 , G01J5/0846 , G01J5/0862 , G01J5/0871 , G01J5/0896 , G01J9/04 , G01J2005/0051 , G01J2005/0074 , G01J2005/583
Abstract: The present invention concerns an unique laser radiometer capable of accurately measuring the radiation temperature of a radiant surface and independently measuring the surface's emissivity. A narrow-band radiometer is combined with a laser reflectometer to measure concurrently radiance and emissivity of a remote, hot surface. Together, radiance and emissivity yield the true surface temperature of the remote target. A narrow receiver bandwidth is attained by one of two methods; (a) heterodyne detection or (b) optical filtering. A direct measurement of emissivity is used to adjust the value obtained for the thermal radiation signal to substantially enhance the accuracy of the temperature measurement for a given subject surface. The technique provides substantially high detection sensitivity over a very narrow spectral bandwidth.
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公开(公告)号：EP0194941A3
公开(公告)日：1988-06-08
申请号：EP86400506
申请日：1986-03-11
Applicant: ZYGO CORPORATION
Inventor： Sommargren, Gary E.
CPC classification number: G01B9/02045 , G01B9/02002 , G01B9/02083 , G01B2290/70 , G01J9/04
Abstract: A heterodyne interferometer system utilizes a single stabilized frequency linearly polarized laser input beam (18) from a light source (10) which is provided to an acousto-optic device (20) along with a frequency stabilized electrical reference signal (32) from an oscillator (30) for transforming the input beam (18) into a pair of orthogonally polarized beams (40,50) differing in frequency by the reference signal frequency prior to providing these beams (40,50) to a polarization type interferometer (70). A mixing polarizer (60) mixes the beams (46,56) after they traverse the interferometer (70) and provides the mixed beams (62,64) to a photoelectric detector (65) where they are utilized to produce an electrical measurement signal (66). This electrical measurement signal (66) is processed in a phase meter/accumulator (68) along with the reference signal (32) to produce an output signal (80) which is the sum of phase difference on a cycle-by-cycle basis between the measurement signal (66) and the reference signal (32). The phase meter/accumulator (68) includes an analog-to-digital converter and a memory register for the previous cycle, with the measurement resolution being determined by the number of bits of the analog-to-digital converter.
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4.发明公开
公开(公告)号：EP0172568A3
公开(公告)日：1987-09-02
申请号：EP85110477
申请日：1985-08-21
Inventor： Calvani, Riccardo , Cisternino, Francesco , Caponi, Renato
Abstract: The method and the device are based on interference techniques. Two quasi-monochromatic radiations (2a, 2b; 102a, 102b; 202a, 202b) with slightly different optical frequencies are generated. A radiation is converted into a 45° linearly-polarized radiation, while the other presents the polarization state imposed by a body under test (4, 204). In each radiation, horizontal and vertical polarization components are separated, and then recombined into two different beams (20a, 21a; 34, 35) comprising radiations at both frequencies, respectively polarized in the same plane. Beatings between the two components of each beam are originated and from the two electrical signals in the radio frequency range thus obtained the information is extracted on the relative phase and the amplitude of the two components of the radiation with polarization imposed by the body under test (4, 204).
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公开(公告)号：EP0158505A3
公开(公告)日：1985-11-21
申请号：EP85302338
申请日：1985-04-03
Applicant: TRW INC.
CPC classification number: G01J9/02
Abstract: An interferometer, and corresponding method, for use in the measurement and correction of wavefront aberrations in a beam of radiation. The interferometer includes optical elements for generating a reference beam with a known wavefront phase characteristic. The reference beam is recombined with the sample beam, to produce an interference pattern indicative of the phase aberrations in the sample beam as compared with the reference beam. An array of detectors produces electrical signals corresponding to discrete elements of the detected pattern, and an electrical circuit for each elemental detector generates phase correction signals to be applied to a set of movable mirror elements arranged to effect phase changes in the sample beam path. The movable mirror elements adjust the elemental path lengths of the sample beam to yield zero detected phase differences. The mirror elements may be integrated into the interferometer, or may take the form of a deformable mirror used for phase compensation of a light beam. The reference beam in the preferred form of the invention is dithered at a high frequency to minimize the effect of noise, and each electrical circuit includes a synchronous detector to remove the dither-frequency component. In accordance with one disclosed form of the invention, the reference beam is not planar but is aberrated in a conjugate relationship with the radiation beam to be corrected, to provide improved control loop performance.
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