Thermal Balance Analysis of a Micro-Thermoelectric Gas Sensor Using Catalytic Combustion of Hydrogen

Sensors

Daisuke Nagai¹  Takafumi Akamatsu¹  Toshio Itoh¹  Noriya Izu¹ 

[1] AIST, 2266-98 Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan;

关键词: thermoelectric gas sensor;    combustion catalyst;    thermal balance;   

DOI  :  10.3390/s140101822

来源: mdpi

【 摘 要 】

A thermoelectric gas sensor (TGS) with a combustion catalyst is a calorimetric sensor that changes the small heat of catalytic combustion into a signal voltage. We analyzed the thermal balance of a TGS to quantitatively estimate the sensor parameters. The voltage signal of a TGS was simulated, and the heat balance was calculated at two sections across the thermoelectric film of a TGS. The thermal resistances in the two sections were estimated from the thermal time constants of the experimental signal curves of the TGS. The catalytic combustion heat Q_catalyst required for 1 mV of ΔV_gas was calculated to be 46.1 μW. Using these parameters, we find from simulations for the device performance that the expected Q_catalyst for 200 and 1,000 ppm H₂ was 3.69 μW and 11.7 μW, respectively.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.