Electromagnetic flow meters for open channels: Current state and development prospects

• Review of electromagnetic water flow measurements for open channels.
• Dedicated method of signal processing in electromagnetic flow meters for open channels.
• Directions of development for electromagnetic flow meters for open channels.
• Low energy electromagnetic flow meter.

Electromagnetic method to measure water flow has been known for nearly 180 years. This paper presents how the method has undergone development and describes in detail the most common electromagnetic flowmeters used for open channels. It also presents specific methods of signal processing used in this type of flowmeters. The analysis is associated directly with the relevant types of induced magnetic field. Some of the analyzed types of magnetic fields considered are sine waves and bipolar rectangular fields. The concept of low-energy electromagnetic flow meter was introduced as part of deliberations concerning current development trends.