Patent ID: 11899160
Assignee: LASERMOTIVE, INC.
Field: Measurement (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 5:
6. A system to detect obstacles to a power beam using frequency domain multiplexing of a plurality of emitter signals, comprising:
a plurality of emitters and a plurality of detectors that form a light curtain patterned about the power beam, the plurality of emitters surrounding the power beam having an emitter module including:
one or more first emitters arranged to modulate a first guard beam signal at a first frequency, the first guard beam signal emitted in proximity to the power beam; and
one or more second emitters arranged to modulate a second guard beam at a second frequency, wherein the first frequency is different than the second frequency, the second guard beam signal emitted in proximity to the first signal; and

the plurality of detectors surrounding the power beam, the plurality of detectors including:
one or more first detectors arranged to detect a first guard beam signal emitted by the one or more first emitters at the first frequency;
one or more second detectors arranged to detect a second guard beam signal emitted by the one or more second emitters at the second frequency,
a controller that directs operations of one or more first detectors and one or more second detectors,
wherein the controller determines that an absence of a first guard beam signal or a second guard beam signal is indicative of a foreign object near or impeding the power beam.