Optical angle measuring device

• US 5,528,358 A
• Filed: 06/29/1993
• Issued: 06/18/1996
• Est. Priority Date: 07/02/1992
• Status: Expired due to Fees

• Current Assignee: Celsiustech Electronics AB
• Original Assignee: Celsiustech Electronics AB
• Inventors: Bjorkman, Bengt, Vogl, deceased, Georg
• Primary Examiner(s): Buczinski, Stephen C.
• Application Number:
  US08/082,932
• Time in Patent Office: 1,085 Days
• Field of Search: 250/206.1, 250/206.2, 250/227.11, 356/141.1, 356/141.5, 356/152.2, 356/141.2, 356/141.3, 356/203.1, 356/203.2, 356/203.3, 385/33
• US Class Current: 356/141.1
• CPC Class Codes: G01S 3/781 Details
• CPC Class Codes: G01S 3/783 using amplitude comparison of signals derived from static detectors or detector systems

Abstract

An optical device for measuring the angular position of electromagnetic radiation, such as laser light, incident on the device, includes a lens system defining an input surface for receiving the incident electromagnetic radiation and an output surface towards which the incident radiation within the optical field of vision of the device is deflected by the lens system, a plurality of light guides each having a first end facing and in direct physical and optical contact with the output surface of the lens system, the first ends of the light guides substantially covering the output surface of the lens system, a detector allocated to each respective light guide and connected to its second end, and a calculating unit for determining a present angular position, based on the signal values outputted by the detectors, by calculating ratio between difference signals and sum signals of signal values of the detectors and determining the angular position corresponding to this ratio.

Claims

1. An optical device for measuring the angular position of electromagnetic radiation, such as laser light, incident on the device, the device comprising:

a lens system defining an input surface for receiving said incident electromagnetic radiation and an output surface towards which the incident radiation within the optical field of vision of the device is deflected by the lens system, a plurality of light guides each having a first end facing and in direct physical and optical contact with the output surface of the lens system, the first ends of the light guides substantially covering the output surface of the lens system, a detector allocated to each respective light guide and connected to the second end of a respective light guide, and a calculating unit for determining a present angular position, based on the signal values outputted by the detectors, said calculating unit calculating ratios between difference signals and sum signals of signal values from the detectors and determining the angular position corresponding to said ratios.

2. An optical device according to claim 1, wherein the lens system is constructed as a compact body divided into lenses having different refractive indexes.

3. An optical device according to claim 2, wherein the edge surfaces of the lens system are at least partially blackened.

4. An optical device according to claim 1, wherein the edge surfaces of the lens system are at least partially blackened.

5. An optical device according to claim 1, wherein for testing of the optical device a further optical device is connected in direct physical and optical contact with the lens system and preferably at the center through its one end while the other end of the further optical device is connected to a light source.

6. Optical device according to claim 1, wherein the correspondence of the ratios to angular positions is stored tabulated.

7. An optical device for measuring the angular position of electromagnetic radiation, such as laser light, incident on the device, the device comprising:

a lens system defining an input surface for receiving said incident electromagnetic radiation and an output surface towards which the incident radiation within the optical field of vision of the device is deflected by the lens system, a plurality of light guides each having a first end facing and in direct physical and optical contact with the output surface of the lens system, the first ends of the light guides substantially covering the output surface of the lens system, a detector allocated to each respective light guide and connected to the second end of a respective light guide, and a calculating unit for determining a present angular position, based on the signal values outputted by the detectors, said calculating unit calculating ratios between difference signals and sum signals of signal values of the detectors and determining the angular position corresponding to said ratios, wherein the lens system comprises a plano-convex lens, the plane surface of which constitutes the output surface of the lens system.

8. An optical device according to claim 7, wherein the lens system is constructed as a compact body divided into lenses having different refractive indexes.

9. An optical device according to claim 7, wherein the edge surfaces of the lens system are at least partially blackened.

10. An optical device according to claim 7, wherein for testing of the optical device a further optical device is connected in direct physical and optical contact with the lens system, preferably at the center through its one end while the other end of the further optical device is connected to a light source.

11. Optical device according to claim 7, wherein the correspondence of the ratios to angular positions is stored tabulated.

12. An optical device according to claim 7 further comprising a negative lens for increasing the field of view, one surface of which constitutes the input surface of the lens system and the other surface of which is turned towards the convex surface of the plano-convex lens.