Flow velocity is the volume or mass of water or air flow through a section per unit of time. In the fields of water conservancy, environment, meteorology, etc., accurate measurement of flow velocity is essential for engineering design and scientific research. Portable velocity meter is a kind of flow measurement equipment that is convenient to carry and operate, and this article will introduce in detail the equipment principle and use method of portable Doppler flow velocity meter and handheld radar flow meter.
1. Portable Doppler flow velocity meter.
A portable Doppler flow velocity meter is a flow velocity measurement device based on the principle of the Doppler effect. It calculates the flow rate by emitting ultrasonic signals and using the Doppler effect to measure the velocity of particles moving in a fluid. The instrument has the following features:
1.Equipment principle: The portable Doppler flow velocity meter emits an ultrasonic beam, and when the ultrasonic beam encounters the particles in the fluid, the particles will scatter back a part of the ultrasonic waves. According to the Doppler effect, the velocity of the particles can be calculated by measuring the change in frequency scattered back, and thus the flow rate can be obtained.
2.How to use: When using a portable Doppler flow meter, first place the instrument on the measuring point to ensure that the ultrasonic beam is able to pass through the fluid. Then, the instrument is started and an ultrasound signal is emitted. The instrument receives the scattered ultrasonic signal and calculates the velocity of the particles to obtain a measurement of the flow rate.
3.Scope of application: Portable Doppler flow velocity meter is suitable for measuring the flow velocity of various liquids and gases, including rivers, pipes, lakes, channels, etc. It has the advantages of wide measurement range, high accuracy and easy operation.
2. Hand-held radar velocity meter.
A handheld radar velocity meter is a flow velocity measurement device based on radar technology. It measures the flow velocity of a fluid by transmitting and receiving radar signals, using the echo time difference of the signals. The instrument has the following features:
1.Equipment principle: The handheld radar velocity meter emits a radar signal, and when the signal encounters the fluid, a part of the signal will be scattered or reflected back by the fluid. Based on the echo time difference of the signal, the flow rate of the fluid can be calculated. Handheld radar velocity meters typically use Doppler radar technology, which can achieve high-precision flow velocity measurements.
2.How to use: When using a hand-held radar velocity meter, the operator holds the instrument in hand and emits the radar signal into the fluid. The instrument receives the echo of the signal and calculates the measurement of the flow rate. Handheld radar velocity meters typically have a display that displays the measurement results in real-time.
3.Scope of application: Handheld radar velocity meter is suitable for measuring the flow velocity of various liquids and gases, including rivers, water pipes, channels, etc. It has the advantages of accurate measurement, easy to use, and easy to carry.
Summary: Portable flow velocity meter is a flow velocity measurement device that is easy to carry and operate, which can be widely used in water conservancy, environment and other fields. Portable Doppler flow rate meter and handheld radar flow rate meter are two common portable flow rate instruments, during use, the operator needs to choose the appropriate instrument according to the specific situation and operate according to the usage method to obtain accurate flow rate measurement results.