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Related Experiment Videos

Dual channel light pulse exposure timer.

D M Clarkson1

  • 1Department of Clinical Physics and Bioengineering, Radiotherapy Centre, University Hospitals Coventry and Warwickshire NHS Trust, Walsgrave Hospital, Coventry, CV2 2DX, UK. douglaas.clarkson@uhcw.nhs.uk

Medical Engineering & Physics
|March 22, 2003
PubMed
Summary
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A new instrument precisely measures laser pulse durations using a light-emitting diode (LED) display and selectable clock rates. This device aids in verifying laser performance and ensuring eye safety standards.

Area of Science:

  • Optoelectronics
  • Laser Technology
  • Measurement Science

Background:

  • Accurate measurement of pulsed light sources is crucial for scientific research and safety applications.
  • Existing methods for pulse duration measurement may lack precision or ease of use for routine applications.

Purpose of the Study:

  • To develop and validate a novel instrument for the routine measurement of pulse durations.
  • To provide a reliable tool for assessing laser and pulsed light source performance characteristics.

Main Methods:

  • The instrument utilizes a four-digit light-emitting diode (LED) display with selectable clock rates from 1 MHz to 100 Hz.
  • Performance was verified using a Schmidt trigger test circuit and silicon photodiodes.
  • A buffered output channel allows for oscilloscope inspection of pulse characteristics.

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Main Results:

  • The developed instrument demonstrated accurate measurement capabilities for pulse durations.
  • Verification confirmed the system's reliability in assessing pulse timing.
  • The device facilitates detailed analysis of laser output and pulsed light systems.

Conclusions:

  • The new instrument offers a practical solution for routine pulse duration measurements.
  • It supports accurate performance characterization of lasers and pulsed light sources.
  • The device is valuable for establishing definitive eye safety assessments based on industry standards.