What Technologies Are Used in Radar Level Gauges?

Radar level gauges can be classified not only according to the grouping method, but also according to the technology applied. In radar level gauges, the common technologies are continuous frequency modulation technology and pulse wave technology, which are relatively Correspondingly, there are two types of radar level gauges, follow us to compare these two types.
There are two types of radar level gauges in the world: pulse method (PULS) and continuous frequency modulation method (FMCW).
Continuous frequency modulation (FMCW) technology:
The continuous frequency modulation (FMCW) technology is used to measure the material level by converting the propagation time into a frequency difference, and the target distance is calculated by measuring the frequency instead of directly measuring the time difference.
Transmit a microwave continuous signal whose frequency is linearly modulated, the frequency increases (decreases) linearly, and the frequency of the received echo signal also increases (decreases) linearly, and the frequency difference between the two will be proportional to the distance from the target.
The frequency-modulated signal is transmitted to the surface of the measured material in the container through the antenna, the received echo frequency signal is mixed with a part of the transmitted frequency signal, and the generated difference frequency signal is filtered and amplified.
A Fast Fourier Transform (FFT) analysis is then performed, which produces a frequency spectrum on which the echo is processed and confirmed.
Pulse Wave Technology:
Pulse wave distance measurement is to transmit a microwave pulse to the surface of the material to be tested by the antenna. After receiving the echo reflected from the surface of the material to be tested, the time difference between the two (that is, the travel time of the microwave pulse) is measured to calculate the distance of the material surface. distance.
The time difference between microwave launch and return is small, measured in nanoseconds for travel times of a few meters. Pulse ranging uses a regular periodic repetition signal with a high repetition frequency (RPF).