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Title: Laser alignment system with modulated field

Abstract

This patent describes a laser alignment system having a transmitter for producing an alignment field in the form of energy directed from a laser and a remotely located receiver for detecting the presence of the alignment field and producing an electrical signal proportional to the magnitude of the laser energy. The improvement comprises: modulation means at the transmitter for turning the laser on and off at a modulation frequency; a band pass filter at the receiver for suppressing components in the electrical signal at frequencies other than the modulation frequency; level detector means for receiving the filtered electrical signal and producing a level signal indicative of the magnitude of the modulation frequency signal component; indicator means coupled to the level detector means for providing an indication to a user when the magnitude of the level signal reaches a present value.

Inventors:
;
Publication Date:
OSTI Identifier:
6422811
Patent Number(s):
US 4674870
Assignee:
Spectra-Physics, Inc., San Jose, CA
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 18 Oct 1985
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; LASERS; ALIGNMENT; CONTROL SYSTEMS; FREQUENCY MODULATION; DIGITAL FILTERS; FREQUENCY MEASUREMENT; LASER RADIATION; REMOTE SENSING; SIGNALS; ELECTROMAGNETIC RADIATION; MODULATION; RADIATIONS; 420300* - Engineering- Lasers- (-1989)

Citation Formats

Cain, G L, and Goren, S B. Laser alignment system with modulated field. United States: N. p., 1987. Web.
Cain, G L, & Goren, S B. Laser alignment system with modulated field. United States.
Cain, G L, and Goren, S B. 1987. "Laser alignment system with modulated field". United States.
@article{osti_6422811,
title = {Laser alignment system with modulated field},
author = {Cain, G L and Goren, S B},
abstractNote = {This patent describes a laser alignment system having a transmitter for producing an alignment field in the form of energy directed from a laser and a remotely located receiver for detecting the presence of the alignment field and producing an electrical signal proportional to the magnitude of the laser energy. The improvement comprises: modulation means at the transmitter for turning the laser on and off at a modulation frequency; a band pass filter at the receiver for suppressing components in the electrical signal at frequencies other than the modulation frequency; level detector means for receiving the filtered electrical signal and producing a level signal indicative of the magnitude of the modulation frequency signal component; indicator means coupled to the level detector means for providing an indication to a user when the magnitude of the level signal reaches a present value.},
doi = {},
url = {https://www.osti.gov/biblio/6422811}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 23 00:00:00 EDT 1987},
month = {Tue Jun 23 00:00:00 EDT 1987}
}