Introduction:
“Light Amplification by Stimulated Emission of Radiation”.
Laser metrology
Laser telemetric system
Laser and led based distance measuring instruments
Scanning laser gauge
Photodiode array imaging
Diffraction pattern technique
Laser triangulation sensors
Two frequency laser interferometer
Gauge wide diameter from the diffraction pattern formed in a laser.
Principle of laser:
The principle involved in laser is when the photon emitted during stimulated emission has the same energy, phase and frequency as the incident photon.
Interferometry
Uses laser in Interferometry
Laser Interferometry:
Two frequency laser source
Optical elements:
Beam splitters Beam benders Retro reflectors.
Laser heads measuring receiver
Measurement display
Types of AC Laser interferometer (ACLI)
Standard interferometer
Single beam Interferometry
Laser interferometer:
AC laser interferometer
Other types of interferometers:
Dual frequency laser interferometer Twyman-Green Interferometer.
Applications:
Linear instruments
Angular measurements
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