OPTICAL FREQUENCY SENSORS BASED ON PRE-MODULATED QUADRATURE-SELF-HETERODYNE INTEFEROMETRY

    公开(公告)号:US20240183714A1

    公开(公告)日:2024-06-06

    申请号:US18527210

    申请日:2023-12-01

    CPC classification number: G01J3/45 G01J3/32 G01J2003/283

    Abstract: An optical frequency sensor that includes (i) a heterodyne modulation and splitting unit that is configured to receive a first laser signal, modulate the first laser signal to provide a modulated laser signal and split the modulated laser signal to provide pre-processed optical signals; (ii) a self-coherent interferometer that includes (ii.1) a first optical processor that is configured to process the pre-processed optical signals to provide processed optical signals, and (ii.2) a detection unit that is configured to electro-optically mix the processed optical signals and photodetect an outcome of the mixing to provide detection signalsm and (iii) a signal processor configured to process the one or more digital signals to provide digital information about the first laser signal.

    Optical module, signal processing system, and signal processing method

    公开(公告)号:US11898841B2

    公开(公告)日:2024-02-13

    申请号:US17426325

    申请日:2020-01-17

    CPC classification number: G01B9/02015 G01J3/45

    Abstract: A processer of an optical module is configured to control a voltage signal having a frequency for causing a movable mirror to resonate, and perform an intensity acquisition process. The intensity acquisition process is a process of acquiring a measurement light intensity of the interference light of the measurement light M times at a first time interval based on the frequency in each of a plurality of cycles among P cycles continuous in the voltage signal, acquiring an addition value of a plurality of the measurement light intensities mutually corresponding for the same number of times, acquiring a laser light intensity of the interference light of the laser light N times at a second time interval based on the frequency in each of the plurality of cycles, and acquiring an addition value of a plurality of the laser light intensities mutually corresponding for the same number of times.

    DETERIORATION EVALUATION METHOD OF LINE SENSOR, SPECTRUM MEASUREMENT DEVICE, AND COMPUTER READABLE MEDIUM

    公开(公告)号:US20240044710A1

    公开(公告)日:2024-02-08

    申请号:US18482411

    申请日:2023-10-06

    CPC classification number: G01J3/45 G01J3/18

    Abstract: A deterioration evaluation method of a line sensor includes detecting an interference fringe of pulse laser light using the line sensor; calculating, based on a signal value obtained from each of a plurality of sensor channels included in a sensor channel range being at least a part of the line sensor in accordance with light intensity of the interference fringe, an evaluation value which is an index of deterioration for each of the sensor channels or each group of the sensor channels, and storing the evaluation value in a storage device; and determining a deterioration state of the line sensor based on the evaluation value.

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