What is Linear Displacement Measurement Linear displacement is movement in one direction along a single axis.
Types of pressure measurements[ edit ] silicon piezoresistive pressure sensors Pressure sensors can be classified in terms of pressure ranges they measure, temperature ranges of operation, and most importantly the type of pressure they measure.
Pressure sensors are variously named according to their purpose, but the same technology may be used under different names. Absolute pressure sensor This sensor measures the pressure relative to perfect vacuum. Gauge pressure sensor This sensor measures the pressure relative to atmospheric pressure.
A tire pressure gauge is an example of gauge pressure measurement; when it indicates zero, then the pressure it is measuring is the same as the ambient pressure.
Vacuum pressure sensor This term can cause confusion. It may be used to describe a sensor that measures pressures below atmospheric pressure, showing the difference between that low pressure and atmospheric pressure, but it may also be used to describe a sensor that measures absolute pressure relative to a vacuum.
Differential pressure sensor This sensor measures the difference between two pressures, one connected to each side of the sensor. Differential pressure sensors are used to measure many properties, such as pressure drops across oil filters or air filtersfluid levels by comparing the pressure above and below the liquid or flow rates by measuring the change in pressure across a restriction.
Technically speaking, most pressure sensors are really differential pressure sensors; for example a gauge pressure sensor is merely a differential pressure sensor in which one side is open to the ambient atmosphere.
Sealed pressure sensor This sensor is similar to a gauge pressure sensor except that it measures pressure relative to some fixed pressure rather than the ambient atmospheric pressure which varies according to the location and the weather.
Pressure-sensing technology[ edit ] Front and back of a silicon pressure sensor chip. Note the etched depression in the front; the sensitive area is extremely thin. The back side shows the circuitry, and rectangular contact pads at top and bottom.
There are two basic categories of analog pressure sensors, Force collector types These types of electronic pressure sensors generally use a force collector such a diaphragm, piston, bourdon tube, or bellows to measure strain or deflection due to applied force over an area pressure.
Piezoresistive strain gauge Uses the piezoresistive effect of bonded or formed strain gauges to detect strain due to applied pressure, resistance increasing as pressure deforms the material.
Generally, the strain gauges are connected to form a Wheatstone bridge circuit to maximize the output of the sensor and to reduce sensitivity to errors. This is the most commonly employed sensing technology for general purpose pressure measurement. Capacitive Uses a diaphragm and pressure cavity to create a variable capacitor to detect strain due to applied pressure, capacitance decreasing as pressure deforms the diaphragm.
Common technologies use metal, ceramic, and silicon diaphragms. Electromagnetic Measures the displacement of a diaphragm by means of changes in inductance reluctanceLVDTHall Effector by eddy current principle.
Piezoelectric Uses the piezoelectric effect in certain materials such as quartz to measure the strain upon the sensing mechanism due to pressure. This technology is commonly employed for the measurement of highly dynamic pressures.
Strain-Gauge Strain gauge based pressure sensors also use a pressure sensitive element where metal strain gauges are glued on or thin film gauges are applied on by sputtering. This measuring element can either be a diaphragm or for metal foil gauges measuring bodies in can-type can also be used.
The big advantages of this monolithic can-type design are an improved rigidity and the capability to measure highest pressures of up to 15, bar. The electrical connection is normally done via a Wheatstone bridge which allows for a good amplification of the signal and precise and constant measuring results .
Optical Techniques include the use of the physical change of an optical fiber to detect strain due to applied pressure.afwl-tr fwl-tr co experimental study of static and dynamic friction between soil and typical construction materials g.
a. leonards. RDP LVDT How it Works Data sheet (kb) These transducers are for displacement / position measurement. They make an accurate position measurement of the movement of the armature (the sliding part) relative to the body of the displacement transducer.
Proportionals Solenoid force opposed by spring force = rate x displacement Spool position is constant, when forces are balanced Input (coil current) is directly proportional to output force.
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