Patent ID: 11921036
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  C  F  Y | IPC F  G

Claim 27:
28. An optical sensor assembly for sensing a velocity of at least part of an industrial combustion process off-gas flow, the sensor assembly comprising:
a first beam emitter/optic sensor pair comprising a first energy beam emitter operable to emit a respective energy beam through a first portion of the off-gas flow, and a first optic sensor positioned for receiving and sensing the energy beam emitted from the first energy beam emitter,
a second beam emitter/optic sensor pair comprising a second energy beam emitter operable to emit a respective energy beam through a second portion of the off-gas flow at a location spaced downstream from the first portion, and a second optic sensor positioned for receiving and sensing the energy beam emitted from the second energy beam emitter,
the first and second optic sensors operable to output electronic signals representative of the sensed energy beam to a processing assembly operable to correlate the electronic signals to an energy absorption signature of said off-gas stream, and wherein said processing assembly is selected to,
correlate the electronic signals received from the first optic sensor to identify the energy absorption signatures of off-gas flow at a first position relative to at least part of the said first beam emitter/optic sensor pair,
correlate the electronic signals received from said second optic sensor to identify the occurrence of the energy absorption signature at a second position relative to at least part of said second beam emitter/optic sensor pair, and
based at least in part on the time between the identification of the energy absorption signature at the first and second positions, provide an output signal based on an identified velocity of at least part of the off-gas flow.