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[Development of Micro-Spectrometer with a Function of Timely Temperature Compensation].

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    Temperature fluctuations impact aircraft position sensors. A new micro-spectrometer with real-time temperature compensation and an optimized optical structure ensures stable output, improving VLS grating sensor reliability.

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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Aerospace Instrumentation

    Context:

    • Aircraft position sensors using Varied Line-Space (VLS) gratings are susceptible to temperature drift.
    • High-low temperature shock environments can degrade micro-spectrometer performance.
    • Accurate real-time temperature compensation is crucial for reliable sensor demodulation.

    Purpose:

    • To analyze the effects of temperature changes on micro-spectrometers.
    • To develop and present a real-time temperature compensation scheme for micro-spectrometers used in VLS grating position sensors.
    • To optimize the traditional cross Czerny-Turner (C-T) optical structure for improved stability and linearity.

    Summary:

    • A novel micro-spectrometer featuring an optimized cross Czerny-Turner (C-T) optical structure was developed for VLS grating position sensors on aircraft.
    • This new design significantly reduces spectrum drift and enhances linearity compared to traditional structures.
    • A real-time temperature compensation scheme utilizing a reference wavelength was implemented, resulting in a compact (80x70x70 mm) and high-performance instrument.

    Impact:

    • The developed micro-fiber spectrometer demonstrates stable output under temperature shock, meeting stringent design requirements.
    • Experimental results show wavelength errors well below the required 0.3 nm threshold, with standard error < 0.1 nm and maximum error of 0.14 nm at ~60 °C.
    • This innovation provides a reliable and accurate solution for demodulating VLS grating position sensors in demanding aerospace environments.