Claims
- 1. A laser line identifier comprising:
- a housing defining an aperture to admit laser radiation;
- focussing means mounted near said aperture to focus said laser radiation into a main beam of tightly collimated radiation;
- a plurality of extremely narrow pass band reflection type optical filters, each tuned to a different frequency component of said main beam and positioned to serially reflect said main beam to a terminal absorber;
- a detector located behind each of said filters in the path of radiation passed by said filter; and
- a primary alarm means coupled to each one of said detectors for generating a humanly perceptible signal, when said component strikes said one detector, and thereby identify the laser responsible for said component.
- 2. The identifier according to claim 1, further including:
- a beam splitter located near said focussing means in the path of said main beam to separate said beam into a first beam of far-infrared radiation and a second beam of near visible radiation including near infrared and ultraviolet, each beam including a portion of said filters and a separate terminal absorber.
- 3. The identifier according to claim 1, wherein:
- said terminal absorber is a wide-band detector to sense any remaining frequency components in said beam; and
- a secondary alarm means to aurally announce the presence of said beam is coupled to said wide band detector.
- 4. The identifier according to claim 1, wherein:
- said primary alarm means is a coded light source.
- 5. The identifier according to claim 3, wherein:
- said secondary alarm means is a coded sound source.
- 6. The identifier according to claim 1, wherein:
- said primary alarm means includes a means to play a prerecorded verbal sound message.
- 7. The identifier according to claim 1, wherein:
- said primary alarm means includes an electronic signal generator, means to broadcast said signal over a limited range and azimuth angle and remotely located means to convert said electronic signal to said humanly perceptible signal.
Government Interests
The invention described herein may be manufactured, used, and licensed by the U.S. Government for governmental purposes without the payment of any royalties thereon.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4450565 |
Copeland |
May 1984 |
|
4751571 |
Lillquist |
Jun 1988 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
0156181 |
Oct 1985 |
EPX |