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首页> 外文会议>Photonic applications for aerospace, commercial, and harsh environments IV >A new double FFT-based filter to reduce the effect of 1/f noise spectrum in a tunable diode laser spectrometer (TDLS)
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A new double FFT-based filter to reduce the effect of 1/f noise spectrum in a tunable diode laser spectrometer (TDLS)

机译：一种新的基于双FFT的新型滤波器可减少可调谐二极管激光光谱仪（TDLS）中1 / f噪声频谱的影响

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摘要

A Tunable diode laser spectrometer (TDLS) system has been designed to scan the near-surface atmosphere for ammonia gas over a wide range of distances (10 m to 1 Km). Since the system is designed for space applications, it needs to be small, lightweight, and low power, which dictates the use of relatively low frequency measurement scans. The spectrometer uses a diode laser, which is subject to a large 1/f noise component at these low frequencies. In this work, digital signal processing techniques are used to maximize the measurement sensitivity of a low frequency TDLS system depending on Double Fast Fourier Transform (DFFT-BF) based- filter. Simulations of the 1/f noise spectrum and ammonia gas absorption peak were performed using a sinusoidal waveform to drive the diode laser. A DFFT-BF-BF method is proposed that reduces, the average of the error in the gas readings to nearly 50 percent. Because, this method decreases the effect of 1/f noise while keeping the measurement signal relatively constant.
机译：设计了可调谐二极管激光光谱仪（TDLS）系统，可在近距离大气（10 m至1 Km）范围内扫描近地大气中的氨气。由于该系统是为航天应用而设计的，因此它需要小巧，轻巧和低功耗，这要求使用相对低频的测量扫描。光谱仪使用二极管激光器，在这些低频下，该激光器会受到较大的1 / f噪声分量的影响。在这项工作中，根据基于双快速傅立叶变换（DFFT-BF）的滤波器，使用数字信号处理技术来最大化低频TDLS系统的测量灵敏度。使用正弦波形驱动二极管激光器，对1 / f噪声频谱和氨气吸收峰进行了仿真。提出了一种DFFT-BF-BF方法，该方法将气体读数的误差平均值降低到近50％。因为，这种方法在保持测量信号相对恒定的同时，降低了1 / f噪声的影响。

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