Regarding radar, the differences in the selection and use of guided wave radar and ultrasonic radar

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First, let’s talk about the characteristics of radar (microwaves): Microwave level measurement. Light is the most well-known wave in the electromagnetic spectrum, and everyone comes into contact with it every day. Microwaves are electromagnetic waves generated by electrical engineering techniques within a specified frequency range. Level measurement uses microwave technology to detect the surface of materials. The physical properties of microwaves are quite unique, as they are hardly affected by differences in gases. In fact, there are no issues with the transmission of microwaves in a vacuum, and the effects of high temperature, high pressure, scaling, and condensates can also be ignored. These characteristics make microwave technology one of the most commonly used measurement principles compared to other measurement principles. Principle of microwaves: Essentially, the principle behind microwave technology is a tracking system that operates using electromagnetic waves with very short wavelengths. The principle of microwaves is also known as radar measurement. Radar information is transmitted and received through a channel consisting of a transmitter, a transmitting antenna, a target, a receiving antenna, and a receiver. The transmitter is a high-frequency output source that emits high-frequency signals in the form of beams. Only a portion of the high-frequency output reaches the radar receiver; whether it is diffuse reflection or total reflection depends on the geometry and material properties. Simply put, radar uses electromagnetic waves for measurement, while ultrasound uses sound waves for measurement. Therefore, ultrasonic waves cannot be used in a vacuum. When measuring liquid levels, the gas composition inside the tank can also affect ultrasonic measurement. And based on this principle, radar can be used in pressure vessels, whereas ultrasound cannot (it can be used at pressures up to 3 kilograms). Regarding frequency and wavelength: speed = frequency × wavelength. The shorter the wavelength, the less likely it is to be interfered with. Therefore, manufacturers classify contactless radars into frequency bands such as 6GHz, 12GHz, 26GHz, etc. This post was last edited by mojie4321 on 2009-2-17 09:22.]