Ultrasonic evaporation sensor, Analog

Ultrasound (US) is called sound above the threshold of human hearing, frequencies between 20 kHz and 1 GHz. (Sounds with an even higher frequency are called hypersonic, below the human audible sound one speaks against it of infrasound).> Ultrasound propagates as a longitudinal wave in gases, liquids and solids. The transition of airborne sound in solids or liquids occurs only when the sound waves are radiated in the immediate vicinity or a coupling medium adapted acoustic properties and certain thickness is present between them. Ultrasound is reflected depending on the material of an obstacle to this or absorbed (insulated, swallowed). To determine the water level of the distance between the sensor on the top of the container and the level is determined by non-contact ultrasonic distance measurement. The duration of ultrasonic pulses is determined.

In the case of ultrasound must take into account that the speed of sound depends on the temperature and the composition of the gas in the container.

Main characteristics of the analog ultrasonic sensor are:

• Analog outputs
• maintenance
• precise