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MICROWAVE MEASUREMENT OF LEVELS IN LIQUID

Micropilot The level transmitter operates on the principle of echo. A rod antenna or a horn antenna directed short microwave pulses of 0.8 ns in duration to the product, they are reflected on its surface, and the same antenna detects your back, this time acting as a receiver (see fig. 1). The distance to the surface area is proportional to the flyback pulse microwave:

D = Ct / 2 D: Distance from the transmitter / surface.

C: Speed \u200b\u200bof Light.

t: transit time in seconds.

Figure 1. microwave level measurement in liquids.

The level L is the height total empty tank, E, minus the distance measure, D: L = E - D. The level L can be up to just below the rod antenna or horn antenna, so that there is no distance restrictions. This instrument, known as Micropilot, operates in the frequency band for industrial, scientific and medical, or ISM band (6 GHz to 26 GHz). Its low power radiation allows secure installation in metal and non metal without any risk to humans or the environment. The microwave level measurement is virtually independent of temperature, pressure or under high vacuum, and the presence of dust or vapor. Microwave pulses travel at the speed of light and are unaffected by the presence of steam.
level measurement in ultrasonic sound wave pulses are generated mechanically by vibration of the air and reflected due to the mechanical properties of the medium. In contrast, the microwave measurement electromagnetic radiation is reflected due to a change in impedance (ie, a change of dielectric constant of the medium in which is reflected). The dielectric constant Er of the product must have a minimum value. Er values \u200b\u200bshould be above 1.4 for applications in still-pipes, or 1.9 in any other case. Above these values, changes in Er no afectan a la medición. Para productos conductores (> 10 mS/cm), la medición resulta totalmente independiente de er.