Optical noncontacting detector

• US 4,412,746 A
• Filed: 03/04/1981
• Issued: 11/01/1983
• Est. Priority Date: 07/16/1980
• Status: Expired due to Term

• Current Assignee: President of Muroran Institute of Technology The No 27-1 Mizumotocho Muroran-Shi Hokkaido Japan
• Original Assignee: The President of The Agency of Industrial Science and Technology
• Inventors: Yokouchi, Hirotaka
• Primary Examiner(s): McGraw, Vincent P.
• Assistant Examiner(s): Dietert, L. A.
• Application Number:
  US06/240,575
• Time in Patent Office: 972 Days
• Field of Search: 356/445, 356/446, 356/373, 250/561, 250/227, 250/375
• US Class Current: 356/446
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01B 11/026 by measuring distance between sensor and object G01B11/0608 takes precedence
• CPC Class Codes: G01B 11/303 using photoelectric detection means

Abstract

An optical noncontacting detector, in which the light projecting and receiving systems share a common axis and the lights of the two systems do not interfere with each other, in order to realize a higher S/N ratio and smaller size and weight than conventional ones.

Claims

1. In an optical noncontacting detector for detecting the roughness of a surface such as ridges and grooves thereon comprising, a light-projecting system for radiating a beam of light on a surface the roughness of which is to be detected and having a tubular barrel having an open front end through which said beam of light is emitted, an elongated light-transmitting means coaxial with the tubular barrel for transmitting the beam of light out of the open end of the tubular barrel without dispersion of light internally of the tubular barrel, a source of light emitting and transmitting said beam of light through said light-transmitting means, a light-receiving system having light-gathering means on said tubular barrel for gathering into the tubular barrel light rays reflected from said surface when said beam of light radiates said surface and having means for converging reflected light rays at an area of reference internally of said tubular barrel, and said light-receiving system comprising reflected-light transmitting means disposed in said tubular barrel outside of said light-transmitting member and shielded therefrom and symmetrically about the longitudinal axis of said tubular barrel for receiving the reflected light rays and converting them into a selected distribution for eventual transducing thereof.

2. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 1, in which said light-gathering means comprises a lens at the front end of the tubular barrel, and said reflected light-transmitting means comprises a mirror system.

3. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 2, including light detectors for detecting the reflected light from said reflected light-transmitting means for transducing thereof to electrical signals.

4. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon, according to claim 3, including an electrical processing system for processing the electrical signals.

5. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 1, in which said light-transmitting means is a shielding tube.

6. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 1, in which the light-transmitting means is a light-transmitting fiber, and in which said reflected-light transmitting means comprises a plurality of light-transmitting fibers.

7. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 1, in which the light gathering means comprises a condenser lens.

8. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon, according to claim 1, in which said light-transmitting means comprises a rod lens and in which said light-receiving means comprises a plurality of fibers coaxial with said rod lens and disposed circumferentially about said rod lens.

9. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 1, in which said light-transmitting means comprises a shielded photofiber, and in which the light-receiving means comprises a bundle of photofibers coaxial with said shielded photofiber and disposed circumferentially about said shielded photofiber.

10. In an optical non-contacting detector for detecting the roughness of a surface such as ridges and grooves thereon according to claim 1, in which the reflected light transmitting means comprises the outer walls of the light-transmitting means.

11. In an optical non-contacting detector according to claim 10, in which said light-transmitting means is a tube.