Another significant difference between Radar and Ultrasonic technologies is in responsiveness to the target material. In both cases the returned signal to the sensor is a reflection from the object being measured. The strength of a reflection from an interface is based on effective change in impedance going from air to the object. In the case of ultrasonic you tend to get a good reflection from most flat objects whose acoustic impedance will normally be orders of magnitude different from air. Generally speaking you will get an equally strong reflection from a flat surface made of steel, plastic, drywall, or calm water surface. In the case of Radar technology the important factor for a material is it's DK value - related to how well the material conducts electricity. So a radar sensor will get very high amplitude reflections from a metal surface, while getting almost no reflection from a plastic surface. Strong echoes can be achieved off of a water surface, but you'll get a much weaker echo from a low DK petrochemical material. If the object of interest is high DK (like water), but there are higher DK obstructions present (eg. metallic objects nearby) then you will get disproportionately stronger response from the false metal targets compared with the water surface compared with an Ultrasonic technology.
Another significant difference between Radar and Ultrasonic technologies is in responsiveness to the target material. In both cases the returned signal to the sensor is a reflection from the object being measured. The strength of a reflection from an interface is based on effective change in impedance going from air to the object. In the case of ultrasonic you tend to get a good reflection from most flat objects whose acoustic impedance will normally be orders of magnitude different from air. Generally speaking you will get an equally strong reflection from a flat surface made of steel, plastic, drywall, or calm water surface. In the case of Radar technology the important factor for a material is it's DK value - related to how well the material conducts electricity. So a radar sensor will get very high amplitude reflections from a metal surface, while getting almost no reflection from a plastic surface. Strong echoes can be achieved off of a water surface, but you'll get a much weaker echo from a low DK petrochemical material. If the object of interest is high DK (like water), but there are higher DK obstructions present (eg. metallic objects nearby) then you will get disproportionately stronger response from the false metal targets compared with the water surface compared with an Ultrasonic technology.
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Can you explain some transistor like NPN and PNP. Where to use and which type is most useful??
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Sir please make a video on different types of control valves and its uses ,
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Sir can you please share drum level control calculations...
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Hai sir please share Analyzers calibration and maintenance
I need SDI Analyzer and TOC Analyzer
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