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    • 8. 发明申请
    • LOCK-IN DEMODULATION TECHNIQUE FOR OPTICAL INTERROGATION OF A GRATING SENSOR
    • 用于光栅传感器的光学插值的锁定解调技术
    • US20090059209A1
    • 2009-03-05
    • US12201256
    • 2008-08-29
    • An-Dien NguyenHong Jiao
    • An-Dien NguyenHong Jiao
    • G01N21/01
    • G01L1/246G01D5/38G01K11/3206
    • A grating sensor and method for optical interrogation of that sensor uses a lock-in technique to achieve simultaneous measurements of strain (and related temperature) and ultrasonic stress wave signals, as well as other environmental conditions that affect a reflection spectrum of the grating sensor. It achieves this by using a lock-in amplifier or a software demodulator to detect slight shifts in the grating reflection spectrum with high sensitivity and accuracy. A dynamic feedback loop based on the lock-in error signal output retunes the light wavelength of the light source (e.g., a tunable laser) or of a wavelength filter in the reflection path to maintain it relative to a specified reflection point of the grating reflector. The lock-in error signal serves as a measure of temperature/strain changes and of ultrasonic vibrations.
    • 该传感器的光栅传感器和光学询问方法使用锁定技术来实现应变(和相关温度)和超声波应力波信号的同时测量以及影响光栅传感器反射光谱的其它环境条件。 它通过使用锁定放大器或软件解调器来以高灵敏度和精确度检测光栅反射光谱的轻微偏移来实现。 基于锁定误差信号输出的动态反馈回路重新调节反射路径中光源的光波长(例如,可调谐激光)或波长滤波器,以使其相对于光栅反射器的指定反射点 。 锁定误差信号用作温度/应变变化和超声波振动的量度。