Stochastic resonance-enhanced laser-based particle detector.
This paper presents a Laser-based particle detector whose response was enhanced by modulating the Laser diode with a white-noise generator. A Laser sheet was generated to cast a shadow of the object on a 200 dots per inch, 512 x 1 pixels linear sensor array. The Laser diode was modulated with a white-noise generator to achieve stochastic resonance. The white-noise generator essentially amplified the wide-bandwidth (several hundred MHz) noise produced by a reverse-biased zener diode operating in junction-breakdown mode. The gain in the amplifier in the white-noise generator was set such that the Receiver Operating Characteristics plot provided the best discriminability. A monofiber 40 AWG (approximately 80 microm) wire was detected with approximately 88% True Positive rate and approximately 19% False Positive rate in presence of white-noise modulation and with approximately 71% True Positive rate and approximately 15% False Positive rate in absence of white-noise modulation.
Dutta
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A
Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA. adutta@ieee.org
Werner
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C
D056044:Actigraphy / Q000295:instrumentation*; D000818:Animals; D004331:Drosophila melanogaster / Q000502:physiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D004924:Escape Reaction / Q000502:physiology*; D007834:Lasers; D010783:Photometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013269:Stochastic Processes