Generation and measurement of pulses and delays with RISC-controllers

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Bengtsson, Lars,1963Chalmers tekniska högskola,Chalmers University of Technology (author)

Generation and measurement of pulses and delays with RISC-controllers

Article/chapterEnglish1997

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1999-01-01
IOP Publishing,1997

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LIBRIS-ID:oai:research.chalmers.se:90a40753-ea7a-4c24-83dc-3c3923d55a8e
https://doi.org/10.1088/0957-0233/8/6/017DOI
https://research.chalmers.se/publication/201251URI

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Language:English
Summary in:English

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An instrument for the generation of pulses and delays has beendeveloped for applications in laserspectroscopy experiments. The pulses from achopped laserbeam are counted, and when a preset value is reached, two signalsare generated: one delayed trigger pulse with constant length and one delayed‘shutter pulse’ (referred to as the ‘shutter window’ below) which opens a light shutterand allows one light pulse to enter the experimental region and excite the sample.The delays of the trigger pulse and the shutter window and the width of the shutterwindow can all be set independently to any value from 0 up to 50 ms with 0.05 mssteps. A separate microcontroller measures the width of the shutter window with anaccuracy of 1micro seconds. The pulse delays and the width of the shutter window are setwith thumbwheel potentiometers connected as voltage dividers. A microcontrollerreads the set values with a four-channel, 12-bit AD converter. This techniquesaves a lot of hardware wiring as well as software writing when compared to thealternative of using separate, BCD-coded thumbwheels for each timesetting.In total, the instrument consists of two independent RISC-controllers: onePIC16C55 for counting chopper pulses and generating pulses and delays, and onePIC16C74 for measuring (and displaying) the width of the shutter window. Thewidth of the shutter window is measured with 1micro second resolution by taking fulladvantage of two different peripherial I/O devices in the PIC16C74: the 16-bit ‘inputcapture’ module and the external interrupt facility.

Subject headings and genre

NATURVETENSKAP Data- och informationsvetenskap Datorteknik hsv//swe
NATURAL SCIENCES Computer and Information Sciences Computer Engineering hsv//eng
NATURVETENSKAP Fysik Acceleratorfysik och instrumentering hsv//swe
NATURAL SCIENCES Physical Sciences Accelerator Physics and Instrumentation hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Inbäddad systemteknik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Embedded Systems hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Reglerteknik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Control Engineering hsv//eng
pulse generation
microcontroller
laser spectroscopy
delay generation

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Chalmers tekniska högskola (creator_code:org_t)

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In:Measurement Science and Technology: IOP Publishing8, s. 679-6830957-02331361-6501

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