| 摘要 |
FIELD: instrumentation.SUBSTANCE: flow of particles is illuminated by light flux to record light signal parameters (amplitude-time analysis and analysis of modulation duration or depth) generated by particles in their transit through isolated area. Photoelectric pulse flux is subjected to primary amplitude discrimination with upper and lower threshold levels. Then, pulse selector allows transit of pulses with length exceeding aforesaid threshold. This allows extra suppression of 20% of dark current pulses. Device for correction of multiple coincidences subjects photoelectric pulses to forced interruption in intervals equal to transit of particles through counting volume. Additionally added are two DACs: one for control over air blower and forced pulse interruption duration and another for changing the illuminator radiation amplitude and adjustment of upper amplitude discrimination threshold. Besides, it incorporates extra ADC, PC for amplitude analysis, count of incoming pulses and control over DACs.EFFECT: higher precision of measurements, ruled out errors.6 dwg |
