SLEEPIR: Synchronized Low-Energy Electronically Chopped PIR Sensor for True Presence Detection
SLEEPIR: Synchronized Low-Energy Electronically Chopped PIR Sensor for True Presence Detection
复制标题
SLEEPIR：用于真实存在检测的同步低能量电子斩波 PIR 传感器
作者：
Libo Wu;F. Gou;Shin‐Tson Wu;Ya Wang
被动红外（PIR）传感器广泛应用于运动传感和照明控制。然而，固定的居住者总是触发PIR传感器的假阴性检测，导致不舒服的照明波动和电子设备的短寿命。为了解决这个问题，本文开发了一种同步低能量电子斩波PIR （SLEEPIR）传感器，用于真实存在检测，其中提出了液晶（LC）光学快门，用于在长波红外（LWIR）区域（8-12 μm）中对PIR传感器接收的信号进行电子斩波，该区域是人体皮肤辐射最大的区域。利用LC材料的各向异性吸收特性，快门在低驱动电压（${V_{
m{rms}}}}$ = 4.17 V）下显示出高调制。与我们之前开发的由电机驱动的机械百叶窗不同，SLEEPIR传感器在保持高灵敏度和可靠性的同时，将功耗、重量、体积和噪音水平分别降低了90.5%、83.8%、82.6%和100%。由于LC快门在LWIR区域的高调制，实验结果表明，SLEEPIR传感器可以在4.0 m范围内以100°的大视场高精度检测静止人员。
Passive infrared (PIR) sensors are widely used in motion sensing and lighting control. However, stationary occupants always trigger false-negative detects of PIR sensors and result in uncomfortable lighting swings and short lifetime of electronic appliances. To address this issue, a synchronized low-energy electronically chopped PIR (SLEEPIR) sensor is developed in this letter for true presence detection, where a liquid crystal (LC) optical shutter is proposed to electrically chop signals received by the PIR sensor in the long-wave infrared (LWIR) region (8–12 μm), where human skin radiates the most. Utilizing the anisotropic absorption property of the LC material, the shutter shows high modulation with a low driving voltage (${V_{{
m{rms}}}}$ = 4.17 V). Instead of using the mechanical shutters previously developed by our group that are driven by motors, the SLEEPIR sensor reduces the power consumption,weight, volume, and noise level by 90.5%, 83.8%, 82.6%, and 100%, respectively, while maintaining high sensitivity and reliability. Thanks to the high modulation of the LC shutter in the LWIR region, the experimental results show that the SLEEPIR sensor could detect stationary occupants with high accuracy within the range of 4.0 m and with a large field-of-view of 100°.