A single-chip CMOS smoke and temperature sensor for an intelligent fire detector

Jimin Cheon, Jeonghwan Lee, Inhee Lee, Youngcheol Chae, Youngsin Yoo, Gunhee Han

Research output: Contribution to journalArticle

28 Citations (Scopus)


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 $\pm$ 1% smoke detection accuracy over the range 4% $\sim$ 25% and $\pm 1~^{\circ}\hbox{C}$ temperature-sensing accuracy over the range $25~^{\circ}\hbox{C}\sim 95~^{\circ}\hbox{C}$. The power consumption of the prototype chip is 220 nW, excluding the infrared light-emitting diode (IR LED).

Original languageEnglish
Article number5153565
Pages (from-to)914-921
Number of pages8
JournalIEEE Sensors Journal
Issue number8
Publication statusPublished - 2009 Aug

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

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