Applications of Low Power CO2 Sensing Technology in Wireless Transmission

Internet of Things(IoT) is actually a large information system based on computer Internet. With RFID and wireless data communication technology, interconnection between software on sensing layer and application layer is built, and a grand information network is thus formed.


With the presence of IoT, wireless connections is creating a network that combines human beings and the world they live in by sensing and driving systems. But the development of wireless technology is restricted by power supply. For example, service life of batteries has always been a concern when people are using mobile phones. Terminal points of IoT are usually sensors which are battery-powered, so low power can be an important advantage for a sensor. Then in IoT applications, which sensors can take the advantage in the competition on power consumption?

As ISweek observes, GSS CO2 sensors have become a favorable option in CO2 monitoring in office and household environments. With their solid, MIR and photodiode technologies, GSS CO2 sensors are of ultra-low power consumption. Their performance is also remarkable, as they can stabilize in less than 2 seconds, and implement measurement twice per second with hourly power consumption less than 3.0 megawatt.

Conventional CO2 sensors adopt incandescence light source which is fragile and will change with the aging of its lamp filament. GSS sensors are different. They are solid and rough, with no fragile elements, making it ideal for the difficult IoT deploy. GSS CO2 sensor family, including its luminous diode and photodiode, are designed and manufactured in Scotland. It emits and detects radiation at 4.3um, which is the major synchronous vibration frequency of CO2 molecular. COZIR LP is a low profile, low power, high performance CO2 sensor. Operating at a 2Hz update rate while only consuming 3mW , its world leading power consumption make it ideally suited for battery operation and portable instruments. COZIR-LP is the third generation of GSS`s CO2 sensing product based on proven IR LED and Detection technology and innovative optical designs. With measurement ranges of 0-2000ppm, 0-5000ppm and 0-1% the COZIR LP Sensor is suitable for applications such as Building Control and Indoor Air Quality.

So how do GSS CO2 sensors detect CO2 in IoT? This sensing unit is consist of a bridging board which has IR emitter and sensing components on it, and a customized optical chamber. During measurement, CO2 diffuses into the optical chamber and absorbs IR radiation. By measuring the input energy of LED source and signal strength received by the photodiode, IR radiation absorbed by CO2 can be calculated. GSS has developed and improved a proper algorithm to compensate temperature, so as to calculate CO2 concentration more accurately.

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