German Baud Plastic Turbine (PVDF) with infrared sensor and pulse output

The turbine is made of PVDF, and the mandrel and the two bearings are made of wear-resistant ceramic (Al2O3). The two infrared transmitters and receivers are located in the electronics housing and are isolated from the media by plastic (infrared radiation can pass through). An infrared diode detects the rotation of the turbine. The electronic component converts the turbine signal into a square wave frequency signal that is proportional to the fluid flow rate. The frequency of the square wave is proportional to the turbine speed. The turbine produces two positive signals per revolution.
The optical method is suitable for medium containing ferromagnetic particles or very turbid fluid (liquid like ink). In addition, the flow direction can also be detected. However, it does not apply to media that will form a coating on the surface of the plastic, nor can there be a strong light source around the sensor.