Browse Prior Art Database

Optical Power Meter

IP.com Disclosure Number: IPCOM000043781D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Gifford, DJ: AUTHOR [+2]

Abstract

Disclosed is an optical meter that can measure continuous wave and pulsed laser beams. A fast photodiode converts light pulses into electrical pulses. The electrical pulses are amplified and electronically processed to determine the pulse characteristics. Referring to the figure, photodiode 1 converts pulsed or continuous wave light into a current which is amplified by amplifier 2. For continuous wave, the amplified value is displayed as the average power. For pulse wave, a sample/hold circuit 3 and multiplier 4 is used to obtain the value of peak power. Multiplier 4 provides wavelength correction for the spectral response of photodiode 1. The pulse width is determined via edge-triggered sweep 5 and sample/hold circuit 6. Multiplier 7 determines the energy content of the pulse by multiplying peak power and pulse width.

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Optical Power Meter

Disclosed is an optical meter that can measure continuous wave and pulsed laser beams. A fast photodiode converts light pulses into electrical pulses. The electrical pulses are amplified and electronically processed to determine the pulse characteristics. Referring to the figure, photodiode 1 converts pulsed or continuous wave light into a current which is amplified by amplifier 2. For continuous wave, the amplified value is displayed as the average power. For pulse wave, a sample/hold circuit 3 and multiplier 4 is used to obtain the value of peak power. Multiplier 4 provides wavelength correction for the spectral response of photodiode 1. The pulse width is determined via edge-triggered sweep 5 and sample/hold circuit 6. Multiplier 7 determines the energy content of the pulse by multiplying peak power and pulse width. The pulse repetition time is converted into an equivalent voltage using a positive triggered JK flip-flop 8, edge-triggered sweep 9 and sample/hold 10. Analog divider 11 divides pulse width into pulse repetition time to obtain duty cycle. The calculated parameters may be displayed on a digital voltmeter using a multiposition switch or analog multiplexer, or fed to a strip chart recorder for continuous monitoring.

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