应用于早期火灾探测的CO传感器

为了实现对火灾的早期探测,设计了一种高精度、高灵敏度CO传感器。该传感器以激射波长的为2.33μm的连续型分布反馈激光器为光源。采用波长调制光谱(WMS)技术与一次谐波量化的二次谐波检测方法相结合的研究手段,对典型环境压力下复杂、重叠的光谱吸收特征进行分离,从而实现了良好的选择性和较高的灵敏度。基于Allan Werle方差的系统长期稳定性评估分析表明,系统的检测限(LoD)为1.18μL/L;当积分时间达到205s时,系统能够实现0.08μL/L的测量精度。最后,纸、棉花以及松木等容易产生阴燃的可燃物燃烧实验表明,所研制的传感器具有良好的早期火灾探测能力。

Development of a CO sensor for early fire detection

A high-precision, high-sensitivity carbon monoxide (CO) sensor was developed for early fire detection. This sensor relied on a continuous wave distributed feedback (DFB) laser emitting at a wavelength of approximately 2.33 μm as an excitation source. A 2f/1f Wavelength Modulation Spectroscopy (WMS) strategy was adopted to isolate complex, overlapping spectral absorption features associated with ambient pressure and to achieve excellent specificity and high detection sensitivity. Allan-Werle deviation analysis was used to evaluate the long-term performance of the CO sensor system. A Limit of Detection (LoD) of 1.18 parts per million by volume (μL/L) was achieved with a measurement precision of 0.08 μL/L for an optimal integration time of~205 s. The early fire detection of paper, cotton, and pine wood was conducted in the field, which verified the reliable and robust operation of the developed sensor.