Patent ID: 9348029
Filing Date: 2016-05-24
CPC Classification: G01S

Claim Text:
1. A method for detection and imaging, the method comprising: transmitting, with a first optical transmitter, a first transmit signal to a location on a surface of an object; transmitting, with a second optical transmitter, a second transmit signal to the location on the surface of the object, wherein at the location on the surface of the object there is a nonlinear optical mixing of the first transmit signal and the second transmit signal to produce a receive signal via optical processes that occur at the location on the surface of the object; receiving, with an optical receiver, the receive signal that is reflected from the object, wherein the receive signal is a function of the first transmit signal and the second transmit signal; and detecting, with a detector, the receive signal that is used to determine presence of the object; wherein a frequency of the receive signal is at least one of the sum of a frequency of the first transmit signal and a frequency of the second transmit signal, and the difference between a frequency of the first transmit signal and a frequency of the second transmit signal.