Displacement measurement
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Displacement measurement is the measurement of changes in directed distance (displacement). Devices measuring displacement are based on displacement sensors, which can be contacting or non-contacting.[1] Some displacement sensors are based on displacement transducers,[2] devices which convert displacement into another form of energy.[3]
Displacement sensors can be used to indirectly measure a number of other quantities, including deformation, distortion, thermal expansion, thickness (normally through the combination of two sensors), vibration, spindle motion, fluid level, strain and mechanical shock.[1]
Displacement sensors exist that can measure displacement on the order of nanometers or smaller.[1]
Application
[edit | edit source]Displacement receivers can be used to study and observe the stress waves passing through a material after it is struck.[4] This can be used, for example, to assess fire damage in reinforced concrete.[4]
Displacement transducers are often used to measure vibration.[5]
Types
[edit | edit source]Optical displacement sensors exist, using reflected light to determine distance.[6]
An ultrasonic displacement sensor is a kind of displacement sensor.[6] These measure the distance to targets by emitting high-frequency sound waves and measuring the time they take to return.[6]
Displacement sensors can be made using linear variable differential transformers.[6]
Strain gauges can be used as the base for small displacement transducers on the order of 0 to 10 mm.[7]
In music, certain music keyboards can be considered to measure displacement in the sense that they respond to displacement, rather than velocity (as is more commonly the case).[citation needed]
Examples of displacement-responding sensors include the mechanical action of tracker organs, as well as the force-sensing resistors found in music keyboards that had polyphonic aftertouch capability. Polyphonic aftertouch is no longer a feature of presently manufactured keyboards, but certain older models such as the Roland A50 featured a pressure sensing resistor, similar in principle-of-operation to a carbon microphone, in each key.[citation needed]
References
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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- ^ a b Hsu, K., Cheng, C., Hsu, S., & Yu, P. (2022). Rapid assessment of fire damage to reinforced concrete structures using the surface wave method with contact and non-contact receivers. International Symposium on Non-Destructive Testing in Civil Engineering (NDT-CE 2022), 16-18 August 2022, Zurich, Switzerland. e-Journal of Nondestructive Testing Vol. 27(9). https://doi.org/10.58286/27289
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).. Excerpt accessed through GlobalSpec
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
