The infrared source EMIRS 50 used in this solution is available in a compact TO-46 package, either with a protective cap or a reflective surface. These configurations can be customized with filters made of sapphire, calcium fluoride, barium fluoride, or tantalum. The Axetris infrared source is well-suited for compact gas detection modules. All Axetris infrared sources are based on micromachined, electrically modulated thermal radiation technology. This patented design delivers true blackbody radiation characteristics across the 2–14 μm wavelength range, offering high emissivity, long operational life, and extremely fast modulation with low power consumption. Over the years, Axetris infrared sources have been successfully integrated into various applications, including medical diagnostics, industrial monitoring, and security systems. Common target gases include CO, CO₂, refrigerants, CH₄, NOx, and alcohol vapors.
To ensure the overall performance and accuracy of the system, it’s not enough to rely solely on the sensor. Shijian has invested significant effort in selecting high-quality supporting components. From the BOM list, we can see that the engineers specifically chose Microchip's power management chip, MIC5253, and the operational amplifier MCP6H02, among other premium electronic parts. This careful selection ensures that the sensor’s full potential is realized.
In addition to hardware, Shijian’s design team has developed supporting software that enables developers to monitor and analyze data from different sensor channels. The sampled data is transmitted via a serial port to the host computer, where the measurement spectrum is displayed. On the left side of the software interface, you can view data from both the reference channel and the CO₂ channel. The white curve represents the reference signal, while the red curve shows the CO₂ detection signal. A two-channel calibration algorithm is used to measure the gas calibration value, and the software also allows for data storage.
When running the NDIR.exe software, make sure you have installed the NDIR driver or the LabVIEW 2014 runtime engine along with the LabVIEW VISA driver (visa540_full.exe). Once these are set up, proceed to configure the serial port. Open the software, select the appropriate serial port number, and apply the following settings:
- Baud rate: 115200
- Data bits: 8
- Parity: None
- Stop bits: 1
Click the "Open Serial Port" button to switch to the "Show Data" mode.
"The company’s high-performance Cortex-M0+-based MCU combined with its power and interface products, along with MEMS-based infrared light sources and sensors, enables Shijian to provide customers with a complete infrared gas detection solution," said Qiu Jiayang, Director of Field Applications at Shijian. These solutions are widely applicable in industrial gas emissions monitoring, coal mine flammable gas detection, environmental monitoring, medical safety, smart buildings, locomotive exhaust analysis, and more.
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