Laser alignment system with modulated field
Patent
·
OSTI ID:6422811
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.
- Assignee:
- Spectra-Physics, Inc., San Jose, CA
- Patent Number(s):
- US 4674870
- OSTI ID:
- 6422811
- Country of Publication:
- United States
- Language:
- English
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