The infrared source EMIRS 50 used in this solution is available in a compact TO-46 package with a protective cap or reflective surface. These structures can be configured with filters for sapphire or calcium fluoride, barium fluoride and tantalum. . The Axetris infrared source is ideal for compact gas detection modules. All Axetris infrared sources are based on micromachined, electrically modulated thermal radiation infrared sources. This patented design provides true blackbody radiation characteristics from 2-14μm, high emissivity and a long lifetime, and it features extremely fast modulation and low power consumption. Axetris infrared sources have been successfully integrated into a variety of medical, industrial and security applications over the years. Typical target gases are CO, CO2, refrigerant, CH4, NOx, respirable alcohol gases, and many more.
Of course, to ensure the overall performance of the solution and improve the measurement accuracy of the system, only the sensor is not enough. Shijian also made a lot of effort in the selection of supporting chips. From the BOM list of the program, we can see that Shijian engineers specially selected Microchip's power chip MIC5253 and operational amplifier MCP6H02 and other excellent peripheral electronic components, so that the characteristics of the sensor can be maximized.
In addition to the hardware, Shijian's design engineers have developed supporting software that allows developers to observe test and analysis data for different sensor channels in the solution. The sampled data is transmitted from the serial port to the host computer, and the measurement spectrum is displayed by software. The left side of the software can observe the data measured by the reference channel and the CO2 channel, wherein the white curve is the reference signal and the red curve is the CO2 detection signal. The gas calibration value can be measured by a two-channel calibration algorithm, and the software can also save the acquired data.
When running the NDIR.exe software, make sure you have installed the NDIR driver or installed the Labview2014 runtime engine and the Labview visa driver (visa540_full.exe) as follows:
Configuring serial port
Open the software, select the corresponding serial port number, and select the following settings:
Baud rate: 115200
Data bits: 8
Check digit: None
Stop position: 1
Finally click the "Open Serial Port" button to switch to "Show Data"
software interface
"The company's high-performance Cortex-M0+-based MCU and power and interface products, combined with MEMS technology's infrared light source and sensor, Shijian provides customers with a complete infrared," said Qiu Jiayang, director of field applications at Shijian. Gas detection solutions can be widely used in industrial gas emissions, coal mine flammable gas leakage monitoring, environmental monitoring, medical safety, intelligent buildings, locomotive exhaust emission detection and other application scenarios."
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