The metal foil is a resistor---it conducts electricity but also resists its flow somewhat. When the sheet is bent one way it stretches the foil slightly, making it longer and thinner. This raises its resistance, since the electricity has further to go and a more constricted path to follow. On the other hand, when the sheet is bent in the other direction it compresses the foil, making it shorter and wider and lowering the resistance. Because the foil strip is so long, even slight strains will cause fairly big changes in the resistance, which will be picked up by the Wheatstone bridge.
How I know if the strain gauge is gone
Advantages and disadvantages of strain gauge
"Mechanical Strain gauges" do not have inductance. There are many types of strain gauge: Mechanical, photoelastic, electrical etc.... Are you wanting the inductance of an electrical strain gauge? if so which type?
it is more sensitive small gauge size low hysteresis
to measure the strain of a particular component
Load cells are strain gauge based sensors used for weighing applications.
mercury in tube strain gage.
metallic bonded strain gauge
the types are1> mechanical strain gauge like single bonded rosette2> electrical resistance strain gauges3> elliptical c/s gauge. e..g bourdon tube etc.
The essential difference is that the bonded strain gauges are bonded on to the specimen whose strain is being measured whereas the unbonded strain gauges are not bonded on to the specimen. As the bonded strain gauges are well bonded on to the specimen, the entire strain being experienced by the specimen is transferred to the strain gauge. However, the bonded strain gauges are affected by temperature changes and also due to transverse strains.For transverse strains and ambient temperature compensations, suitable circuits for compensation can be used using Wheatstone's bridge. The unbonded strain gauges cannot transfer the strain of the specimen to the strain gauge and hence it is used mainly for displacement, or pressure or force transducers. It is least affected by transverse strain and temperature compensation of unbonded gauges cis automatically eliminated using Wheatstone's bridge.
The strain gage indicates strain, and the stress is from Hooke's law; stress = modulus times strain so you need to know the modulus of elasticity
Yes.it is an active transducer.
"When the gauge factor of a strain gauge is 2 stress is 1050 kgcm2 Y 2.1 106 kgcm2 and R is 100 ohms then the value of DR will be?"
why doesn't my rpm gauge and temp gauge, fuel gauge not work
photovoltaic cell & strain gauge are active tds b/c we don't required any external power 4 there operation.
A strain gauge.
these are very costly and cannot meet all the requirements. the values we get from this are also not exact .so,electrical strain come into progress
Yes you can. All materials experience microstrain. The mesurement of the microstrain on a glass bottle comes down to successfully attaching the right type of strain gauge to the glass.
Strain gage and Extensometer both are same purpose to check the stress and strain in selective test pieces, but traditional they were using strain gage its take the preparation time is high and Extensometer we are check the directly both results are same.
A strain gauge usually as a label on it indicating two things ,the range and so many mV/V output.If the range is 0 - 2 te and the mV/V is 1.5mV/V we then need to know the excitation voltage(V) of the instrument feeding the strain gauge.If the excitation voltage is 10 V then at the top end of the strain gauge (2te) the output of the strain gauge is 1.5mV X 10 =15mV.The mV output is indicated for it's range (2te) but is linear throughout the range therefor for half the range 1te the mV output is halved to 0.75 x 10 = 7.5mV.0te - 0mV0.5te - 3.75mV1te - 7.5mV1.5te - 11.25mV2te - 15mV
Advantages and disadvantages of load cellBest Answer:1.-Advantages load cells Strain gauge load cells can be use for weighing purposes. Strain gauge load cells can also be use for material testing in process industry also. Strain gauge load cells are also used in tensile test machines as a major component. Strain gauge load cells can be used for both expansion and compression. Strain gauge load cells are less costly so mostly used in the industry. Strain gauge load cells are used in automotive industry to check the structural performances of the material used in doors, hoods, trunksetc.2.-Disadvantages load cells It requires continuous electric energy for the production and display of signals. It also requires an amplification circuit for the generation of output display because the signals produced by the gauge itself are of very much low voltage almost in milli volts. It cannot be used for the pressure measurement of highly reactive or corrosive materials because they can damage the gauge. It cannot be used for the measurement of very high pressure if the diaphragm use is of plastic.
An alternator does not need a gauge to work. It is used to monitor the output of the alternator.
Merits of strain gauges are its light-weight, high frequency bandwidth and use simple transducers. Disadvantages are its sensitivity to temperature and low resistance to flow of current.
If it gets to hot the thermostat wont work. you need to repace it and the gauge will work again.