Chapter 7- 8 Review

The characteristic of certain crystals to develop an electrical potential when subjected to mechanical stress. Rochelle salt and quartz are examples of these crystals.

• laser interferometric gauge

• reed switch

• capacitance

• piezoelectric effect

An electrical device with an actuator that is mechanically linked to a set of contacts. When activated, contacts that are normally open are closed, and contacts that are normally closed are opened. This causes a change of state to an electrical circuit.

• stadimetry

• X-rays

• limit switch

• nanometer

A device that produces a magnetic field in a detector unit. The magnetic field induces eddy currents into any conductive material that is near the probe. A pick-up coil senses a change in magnetic field intensity when an object enters the field.

• optical proximity sensor

• eddy current proximity sensor

• X-rays

• sound sensor

A sensor made of fine-gage resistance wire mounted on a strip of insulation that measures mechanical movement.

• infrared sensor

• strain gauge

• eddy current proximity sensor

• computer vision sensor

The range of visible and invisible light, which includes frequencies for radio, television, radar, infrared radiation, visible light, ultraviolet light, X-rays, and gamma rays.

• laser interferometric gauge

• electromagnetic spectrum

• eddy current proximity sensor

• inductive transducer

An opto-electronic element that varies in conductivity according to fluctuations in light. Electrical resistance decreases when light is more intense and increases when light intensity decreases.

• ultraviolet sensor

• electromagnetic spectrum

• photoconductive device

• sound sensor

A device that reacts to sound. Standing sound waves are generated within a cylindrical, open-ended cavity inside the sensor. The presence of a nearby object interferes with these sound waves, which alters the sensor output.

• eddy current proximity sensor

• transducer

• thermocouple

• acoustical proximity sensor

A device that detects spatial relationships and provides depth information using stadimetry and triangulation.

• infrared sensor

• computer vision sensor

• electromagnetic spectrum

• angstrom

A simple type of magnetic field sensor that either makes or breaks contact in response to changes in a magnetic field.

• thermoelectric sensor

• reed switch

• infrared sensor

• limit switch

Strands of material made of glass or plastic that can transmit light from one point to another regardless of how the material is bent or shaped.

• thermocouple

• magnetic field sensor

• tactile sensor

• optical fibers