Temperature Compensation Algorithm of Nondispersive Infrared (NDIR) Gas Sensor

A One ppm NDIR Methane Gas Sensor with Single Frequency Filter Denoising Algorithm

A non-dispersive infrared (NDIR) methane gas sensor prototype has achieved a minimum detection limit of 1 parts per million by volume (ppm). The central idea of the design of the sensor is to decrease the detection limit by increasing the signal to noise ratio (SNR) of the system. In order to decrease the noise level, a single frequency filter algorithm based on fast Fourier transform (FFT) is ...

Room-temperature mid-infrared laser sensor for trace gas detection.

Design and operation of a compact, portable, room-temperature mid-infrared gas sensor is reported. The sensor is based on continuous-wave difference-frequency generation (DFG) in bulk periodically poled lithium niobate at 4.6 mum, pumped by a solitary GaAlAs diode laser at 865 nm and a diode-pumped monolithic ring Nd:YAG laser at 1064.5 nm. The instrument was used for detection of CO in air at ...

Infrared gas sensor

This paper proposes a new measurement scheme of gas concentration by infrared sensor, for high accuracy measurement of gas concentration and safety protection. Furthermore, the principle of infrared absorption, test methods and optical chamber structure are expounded. And a double-beam differential detection system is designed. The paper key to introduce the software and hardware design of infr...

Infrared Gas Sensor

Non-selective NDIR array for gas detection

A micro component for a non-selective NDIR (non dispersive infrared) gas detection system is presented in this work. This device consist of an IR detection module composed of two matching arrays, one of filters and one of thermopile detectors. These arrays (up to 4x4 elements) are built on a silicon substrate using CMOS compatible materials and processes. Bulk micro-machining is used to build t...