Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-05-27
1995-06-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
3561415, 250237G, G01J 120
Patent
active
054282152
ABSTRACT:
An apparatus for detecting a beam of radiation, such as a collimated laser beam, and determining the angle-of-arrival of that beam with a high angular resolution, the apparatus comprising a linear array of radiation detectors arranged in a plane and a digital Gray code shadow mask, located at a predetermined height above and parallel to the plane. The Gray code shadow mask is provided with parallel rows containing slot(s) with each of those rows being centrally positioned directly above one of the radiation detectors and arranged so that the rows are perpendicular to the linear array. The slot(s) in each row are located at predetermined distances from the center of a row with those distances differing for each row. A well collimated radiation beam, such as from a laser, directed towards the shadow mask will project images of the slots onto the plane with the positions of the images being dependent on both the positions of the slots and the angle-of-arrival of the beam. This will result, according to the digital Gray code, in some of the images being located on some of the radiation detectors, each of which will then generate an output signal, while some of the radiation detectors will be located in between the images of the slots and not generate any signal. Since the location of the images of the slots is dependent on the angle-of-arrival of the beam, that angle-of-arrival can then be determined from the outputs of all the radiation detectors.
REFERENCES:
patent: 2855539 (1958-10-01), Hoover, Jr.
patent: 3553466 (1971-01-01), Jonston
patent: 3858201 (1974-12-01), Foster
patent: 4806747 (1989-02-01), Dunavan et al.
patent: 4857721 (1989-08-01), Dunavan et al.
patent: 4874937 (1989-10-01), Okamoto
patent: 5173602 (1992-12-01), Lin
patent: 5276496 (1994-01-01), Heller et al.
patent: 5355222 (1994-10-01), Heller et al.
Cantin Andre
DuBois Jacques
Gravel Maurice
Her Majesty the Queen in right of Canada, as represented by Mini
Lee John R.
Nelms David C.
LandOfFree
Digital high angular resolution laser irradiation detector (HARL does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital high angular resolution laser irradiation detector (HARL, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital high angular resolution laser irradiation detector (HARL will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-289023