PRECISION INSTRUMENT BASED ON LASER:

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