CPC H04N 25/702 (2023.01) [G01J 1/44 (2013.01); H04N 25/75 (2023.01)] | 12 Claims |
1. A method of obtaining an image, comprising:
receiving an optical signal at a detector;
generating, at the detector, an electrical signal in response to receiving the optical signal, wherein a frequency of the electrical signal is indicative of a frequency of the optical signal;
receiving the electrical signal at a first detection/readout circuit and at a second detection/readout circuit, wherein the first detection/readout circuit is sensitive to a first frequency signal range of a laser and the second detection/readout circuit is sensitive to a second frequency signal range of an imaging signal;
filtering the electrical signal at a high pass filter contained in the first detection/readout circuit to pass an asynchronous signal component within the first frequency signal range to an asynchronous laser pulse detector (ALPD) readout integrated circuit of the first detection-readout circuit;
reading the signal component within the first frequency signal range at the ALPD readout integrated circuit;
filtering the electrical signal at a low pass filter of contained in the second detection/readout circuit to pass a signal component within the second frequency signal range to an imaging readout integrated circuit of the second detection/readout circuit; and
reading the signal component within the second frequency signal range at the imaging readout integrated circuit,
wherein the first detection/readout circuit resides on top of the second detection/readout circuit and wherein the electrical signal passes along a first electrical pathway that leads from the detector to the first detection/readout circuit and the signal component within the second frequency signal range passes along a second electrical pathway that passes through the ALPD readout intergrated circuit to the imaging readout integrated circuit.
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