A strain gauge measures changes in the length of an object and is widely used in materials testing and scientific research. The original contact strain gauge required physical contact with the object being measured, but non-contact optical strain gauges have been developed. Calibration and protection are important for accurate readings.
A strain gauge, also sometimes called a strain gauge, is a device that measures changes in the length of an object. These variations can be so small that they cannot be identified with the naked eye, or significant enough that someone can clearly see them. Strain gauge, as the practice of measuring such variations is known, is widely used in materials testing. Tensile testing usually requires a strain gauge and these devices are also used in scientific research to make and record important observations.
The original strain gauge, developed in the 1800s, was a contact strain gauge, which required contact with the material being measured to function. As the length of the material fluctuated, a physical reading appeared on the strain gauge. This could be used in stress testing, to find out how much objects and materials deform under stress. However, needing to be in physical contact with the object being measured could also be a problem, as it could skew the results or be impractical for some types of tests.
As a result, non-contact strain gages have been developed. These use optical strain gages, typically with a laser, to measure changes over distance. Optical strain gauge can be very precise and detailed, with the ability to detect minute fluctuations and provide a reading for the person administering a test or experiment. The cost of such systems varies depending on the objects they are designed to measure and their accuracy.
Like other devices used to take measurements, a strain gauge needs to be calibrated. Calibration is typically performed at the factory where the device is manufactured as part of the quality control process, ensuring the device performs as advertised when delivered. People also need to recalibrate periodically to confirm that the device is working properly. This can be done in a facility with a calibration kit or by sending the strain gauge for examination to a laboratory specialized in calibration activities.
When not in use, a strain gauge must be protected for it to function properly. Many come with protective covers and cases that can be used to shield the device when it’s not in active use. The devices must also be stored in a way that protects them from shocks, as bumps and sudden movements can drop the device, making its readings inaccurate and causing problems for people working with the strain gauge. Maintaining and protecting equipment such as strain gauges is a collective effort involving both equipment technicians and users.
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