EP0445293A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Light receiving system of heterodyne detection and image forming device for light transmission image using said light receiving system
Assignee: TOIDA Masahiro
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Filing: 1990-05-30
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Granted: —
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Expires: 2010-05-30
Abstract
Abstract A transmitted light generated when a beam from a laser beam source (01) is applied to a specimen is combined with a laser beam from a local oscillation beam source (02) whose frequency is different from that of the applied laser beam through a half mirror (03), and the combined light is received by a light receiving element (04) that restricts each division area to not larger than a minimum space resolution unit where an interference between different points is generated when the propagation area of light is divided to generate a Fraunhofer diffraction image. The whole or part of the Fraunhofer diffraction image of the zero order, or a diffraction image up to n times the zero order spectrum are detected by a photodetector (05). Since the transmitted image can be separated from a scattering component and detected by extracting the beat component of the combined light, and information on an absorber can be obtained even when the scattering component is large such as with light passed through a specimen of an organism, etc., the application of this device to the optical CT, etc. becomes possible.
Inventors
- 👤 Tsutomu Dai 3 Green Haitsu-Zuiho 301 Ichimura
- 👤 Fumio 1-13-1 Yagiyama-Minami Taihaku-Ku Inaba
- 👤 Masahiro Residence Minami C Toida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 21:23
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01J; G01J9/00; G01J9/04; G01N2021/178; G01N2021/1785; G01N2021/1787
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
55 words
A heterodyning receptor system characterized in that: laser light is directed onto a scatterer, and the transmitted light is photomixed with another laser light having a frequency different from that of said laser light to detect a beat component from the resulting light, whereby a coherent component is extracted from incoherent light from said scatterer.
Claim 2
Dependent Claim
22 words
A heterodyning receptor system as claimed in Claim 1, wherein the coherent component is extracted in the form of a plane wave.
Claim 3
Dependent Claim
22 words
A heterodyning receptor system as claimed in Claim 1, wherein the coherent component is extracted in the form of a spherical wave.
Claim 4
Dependent Claim
113 words
A heterodyning receptor system characterized by including a laser beam transmitted through a sample, photomixing means for photomixing said laser light with another laser light having a frequency different from that of said laser light, a receptor element which the resulting light enters and divides a light propagating zone into a plurality of sub-zones and a detector for detecting a beat component of the photomixed light out of light leaving said receptor element, said receptor element having an exit end, at which a spatial zone, which is defined between different points and in which interference occurs, is limited within a spatially resolvable minimum unit to detect the beat component of the photomixed light.
Claim 5
Dependent Claim
45 words
A receptor system as claimed in Claim 4, wherein said spatially resolvable minimum unit is limited by detecting a diffraction image at most n times as large as the 0 order spectrum of a Fraunhofer diffraction image at the exit end of said receptor element.
Claim 6
Dependent Claim
35 words
A receptor system as claimed in Claim 4, characterized by detecting the whole or a part of the 0 order diffraction image of a Fraunhofer diffraction image at the exit end of said receptor element.
Claim 7
Dependent Claim
34 words
A receptor system as claimed in any one of Claims 4 to 6, characterized in that said receptor element is made up of an elongated pipe having pinholes at its entrance and exit ends.
Claim 8
Dependent Claim
37 words
A receptor system as claimed in any one of Claims 4 to 6, characterized in that said receptor element is made up of a hollow, elongated pipe coated on its wall face with a light absorbing material.
Claim 9
Dependent Claim
43 words
A receptor system as claimed in any one of Claims 4 to 6, wherein said receptor element is made up of an optical fiber having core and clad portions, said core portion being smaller in the index of refraction than said clad portion.
Claim 10
Dependent Claim
37 words
A receptor system as claimed in any one of Claims 4 to 6, characterized in that said receptor element includes a long-focus lens whose front and back focuses are located at its entrance and exit ends, respectively.
Claim 11
Dependent Claim
48 words
A receptor system as claimed in any one of Claims 4 to 6, characterized in that said receptor element includes an objective whose front focal position is located at said sample and an eyepiece whose front focal position is located at the back focal position of said objective.
Claim 12
Dependent Claim
144 words
An arrangement for visualizing optical transmission images, characterized by including a stage for moving a sample, means for directing one of two laser beams with a given frequency difference therebetween onto said sample and photomixing the transmitted light with the other laser beam, a receptor element which the resulting light enters and divides a light propagating zone into a plurality of sub-zones, said receptor element having an exit end, at which a spatial zone, which is defined between different points and in which interference occurs, is limited within a spatially resolvable minimum unit, and a detector for detecting a beat component of the mixed light out of light leaving said receptor element, means for computing the detected signals, and means for displaying the result of said computing, whereby a beat component is extracted from light leaving said sample to visualize an optical transmission image.
Claim 13
Dependent Claim
51 words
An arrangement for visualizing optical transmission images as claimed in Claim 12, characterized in that said spatially resolvable minimum unit is limited by detecting a diffraction image at most n times as large as the 0 order spectrum of a Fraunhofer diffraction image at the exit end of said receptor element.
References Cited (Backward Citations)
No citation records indexed.
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