Odor Gas Sensor

The sensitive material of the odor gas sensor is the key to detecting gas concentration. A sensitive material is usually a chemical substance that has the property of being sensitive to a specific gas. When gas molecules come into contact with sensitive materials, they cause physical or chemical reactions that lead to changes in electrical properties. The sensitive material is generally a nanomaterial, such as zinc oxide, silicon nitride, etc. Its particle size is typically in the nanometer range, which gives them high surface area and reactivity, which can greatly increase reaction speed and sensitivity.

The signal detected by the odor gas sensor needs to be transmitted to the data receiver through the transmitter for processing and analysis. The transmitter is usually an analog circuit integrated on a chip. Its main function is to amplify and filter the electrical signals generated by sensitive materials, and then convert them into digital signals for transmission to the data receiver. The transmitter can also process the signal as needed, such as increasing resolution, reducing noise, etc.

As the last line of defense for smell sensors, the data receiver needs to receive and process the signals transmitted by the transmitter. The data receiver is usually a microcontroller whose main task is to decode the received digital-to-analog conversion signal and then send the decoded data to the processing unit.