A Single-Chip CMOS Smoke and Temperature Sensor for an Intelligent Fire Detector

作者：Cheon Jimin^*; Lee Jeonghwan; Lee Inhee; Chae Youngcheol; Yoo Youngsin; Han Gunhee

来源：IEEE Sensors Journal, 2009, 9(8): 914-921.

DOI：10.1109/JSEN.2009.2024703

• Correlated double sampling
• fire detector
• light scattering
• smoke detection chamber
• smoke sensor

A single-chip CMOS smoke and temperature sensor for use as an intelligent fire detector is proposed. The proposed smoke sensor measures smoke density based on the light-scattering method. The temperature sensor is integrated with the smoke sensor not only to sense heat from a fire but also to compensate for the temperature dependency of the smoke sensor. The prototype chip includes an on-chip photodiode (PD), pixel circuit, correlated double sampling (CDS) circuit, and analog-to-digital converter (ADC). The prototype chip was fabricated using a 0.35-mu m CMOS process and was placed inside the smoke detection chamber, while the thermistor for the temperature sensor is placed outside the chamber. The measurement results show +/-1% smoke detection accuracy over the range 4% similar to 25% and +/-1 degrees C temperature-sensing accuracy over the range 25 degrees C similar to 95 degrees C. The power consumption of the prototype chip is 220 nW, excluding the infrared light-emitting diode (IR LED).

• 出版日期2009-8