Reflectometers

• US 4,268,173 A
• Filed: 12/18/1978
• Issued: 05/19/1981
• Est. Priority Date: 12/22/1977
• Status: Expired due to Term

• Current Assignee: Medistron Limited
• Original Assignee: Direct Power Limited
• Inventors: Francis, Phillip W., Barnard, William R.
• Primary Examiner(s): ROSENBERGER, RICHARD A
• Application Number:
  US05/970,117
• Time in Patent Office: 883 Days
• Field of Search: 356/443, 356/444, 356/445, 356/446, 356/447, 356/448, 356/244, 356/36
• US Class Current: 356/445
• CPC Class Codes: G01N 21/474 Details of optical heads therefor, e.g. using optical fibres

Abstract

An optical reflectometer includes an optical head having a measuring chamber defined therein and a measuring zone defined within the chamber. A pair of non-parallel bores are defined within the front wall of the head and optically lead into the measuring chamber so as to intersect at the measuring zone. A light source is optically associated with one of the bores while a photodetector is optically associated with the other one of the bores. A carrier, having a cut-away section defined within its front wall for accommodating the light path defined by the light source, the measuring zone, and the photodetector, is removably disposed within the optical head and serves to carry, and position, a test object with respect to the measuring zone, the object, in turn, being removably disposed within the carrier.

Claims

1. An optical reflectometer, comprising:

means, including at least a front wall, for defining a chamber;

means defining an incident light path extending from said front wall of said chamber-defining-means to said chamber;

carrier means, removably disposed within said chamber and having means for accommodating said incident light path defined within said chamber-defining-means, for removably guiding a test object relative to said carrier means and for carrying said test object, along a fixed path intercepting said incident light path, to a fixed position located within said incident light path; and

photoresponsive means for receiving light reflected from said test object.

2. An optical reflectometer as set forth in claim 1, wherein:

said front wall further includes means for defining a reflected light path for transmitting said reflected light from said test object to said photoresponsive means.

3. An optical reflectometer as set forth in claim 1, wherein:

said means defining said chamber further comprises two opposing sidewalls extending rearwardly from said front wall, said two sidewalls being recessed so as to define a channel for slideably receiving said carrier means.

4. An optical reflectometer as set forth in claim 1, wherein:

the front face of said carrier means abuts the rear face of said front wall of said means defining said chamber.

5. An optical reflectometer as set forth in claim 1, wherein:

said carrier means comprises a substantially rectangularly shaped block having slot means defined therein for slideably receiving said test object in the form of a flat strip.

6. An optical reflectometer as set forth in claim 5, wherein:

said block is tapered so as to positively locate said block within said chamber-defining-means.

7. An optical reflectometer as set forth in claim 5, wherein:

said slot means includes a resilient protuberance for locating said test object therein substantially without any clearance between said test object and the walls of said slot means.

8. An optical reflectometer as set forth in claim 1, wherein:

a solid state light source provides said incident light.

9. An optical reflectometer as set forth in claim 8, wherein:

said solid state light source comprises a light emitting diode.

10. An optical reflectometer as set forth in claim 1, further comprising:

color filter means disposed within said incident light path.

11. An optical reflectometer as set forth in claim 1, wherein:

said fixed path lies substantially perpendicular to a plane containing both said incident and reflected light.

12. An optical reflectometer as set forth in claim 1, wherein:

said means defining said incident light path comprises a bore defined within said front wall of said chamber-defining-means; and

said means for accommodating said incident light path comprises a cut-away portion defining an aperture within said carrier means.

13. An optical reflectometer, comprising:

means for defining a chamber and including a front wall and a pair of opposed sidewalls extending rearwardly from said front wall;

first means defining an incident light path extending from said front wall of said chamber-defining-means to said chamber;

carrier means, removably disposed within said chamber behind said front wall and between said opposed sidewalls and having means for accommodating said incident light path defined within said chamber-defining means, and having slot means defined therein for removably guiding a test object relative to said carrier means and for carrying said test object, along a fixed path intercepting said incident light path, to a fixed position located within said incident light path;

second means defining a reflected light path extending from said chamber to said front wall of said chamber-defining-means; and

photoresponsive means disposed outside of said chamber for receiving reflected light from said test object along said reflected light path.