Platinum IR sources for NDIR gas monitors

Puton, Jarosław; Jasek, K.; Siodlowski, Boguslaw; Knap, A.; Wiśniewski, Kazimierz

doi:10.1109/isse.2001.931051

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…The source should emit radiation that has relatively high power and enables its deep modulation with supplying using variable voltage. Working out structures of such sources was a crucial issue during construction works o the capnometer model 6,7 Several models of JR sources assigned for direct modulation were constructed. Their heaters were made from foil and thick platinum layers.…”

Section: Model Of a Side-stream Capnometermentioning

confidence: 99%

Module for measurement of CO 2 concentration in exhaled air

Puton

Pałko

Knap

et al. 2003

Optoelectronic and Electronic Sensors V

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The obj ective of this work consists in working out of a detection module for capnography (carbon dioxide concentration measurement in anaesthesiology and intensive care). The principle of operation of the module consists of the NDIR method. The basic assumption for construction ofthis model was using of directly modulated thermal JR source in it. A few models of JR sources were worked out. Their heaters were made from thick platinum layers and foil. Limits of modulation frequency for JR sources were greater than 30 Hz.The detection module consists of an optical part, analogue electronics and microprocessor system with a suitable program. The time dependent concentration of C02, end tidal concentration of C02, mean concentration of N20 and breath frequency are output values of the detection module. Measurements are executed 30 times per second. The accuracy of CO2 concentration measurement equals to 5%.

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Section: Model Of a Side-stream Capnometermentioning

confidence: 99%

Module for measurement of CO 2 concentration in exhaled air

Puton

Pałko

Knap

et al. 2003

Optoelectronic and Electronic Sensors V

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“…Use of a micro-heater is necessary in most gas sensors because the gas chemical reaction in the sensing layer takes places at high temperatures. Furthermore, a micro-heater can be used as the infrared source in a non-dispersive infrared (NDIR) gas sensor [ 3 , 10 , 14 , 15 ]. The micro-heater is used to radiate infrared radiation to make the gas molecules excited inside the gas sensing chamber.…”

Section: Introductionmentioning

confidence: 99%

“…The micro-heater is used to radiate infrared radiation to make the gas molecules excited inside the gas sensing chamber. Generating higher levels of heat from the micro-heater is a very important factor in improving the sensitivity of the NDIR sensor [ 10 , 15 ] since infrared absorption of gas in the NDIR gas sensing chamber increases with increasing infrared radiation through the micro-heater. In addition, nowadays much interest is being paid to miniaturization and low power driving of sensors.…”

Section: Introductionmentioning

confidence: 99%

Development of Micro-Heaters with Optimized Temperature Compensation Design for Gas Sensors

Hwang

Shin

Roh

et al. 2011

Sensors

128

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One of the key components of a chemical gas sensor is a MEMS micro-heater. Micro-heaters are used in both semiconductor gas sensors and NDIR gas sensors; however they each require different heat dissipation characteristics. For the semiconductor gas sensors, a uniform temperature is required over a wide area of the heater. On the other hand, for the NDIR gas sensor, the micro-heater needs high levels of infrared radiation in order to increase sensitivity. In this study, a novel design of a poly-Si micro-heater is proposed to improve the uniformity of heat dissipation on the heating plate. Temperature uniformity of the micro-heater is achieved by compensating for the variation in power consumption around the perimeter of the heater. With the power compensated design, the uniform heating area is increased by 2.5 times and the average temperature goes up by 40 °C. Therefore, this power compensated micro-heater design is suitable for a semiconductor gas sensor. Meanwhile, the poly-Si micro-heater without compensation shows a higher level of infrared radiation under equal power consumption conditions. This indicates that the micro-heater without compensation is more suitable for a NDIR gas sensor. Furthermore, the micro-heater shows a short response time of less than 20ms, indicating a very high efficiency of pulse driving.

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Platinum IR sources for NDIR gas monitors

Cited by 2 publications

References 4 publications

Module for measurement of CO 2 concentration in exhaled air

Module for measurement of CO 2 concentration in exhaled air

Development of Micro-Heaters with Optimized Temperature Compensation Design for Gas Sensors

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