Stray light jamming resistance photoelectric detecting system based on digital phase locking

A photoelectric detection and digital phase-locking technology, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of unusable equipment, affecting measurement accuracy and equipment stability, etc., to meet technical needs and expand instruments The lower detection limit and the effect of improving the measurement signal-to-noise ratio

Pending Publication Date: 2017-08-25
西石(厦门)科技股份有限公司
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Problems solved by technology

[0003] At present, more and more optical detection technologies are used in the field of pollutant monitoring. Stray light interference often becomes an important problem affecting measurement accuracy and equipment stability. Especially in the ultra-low emission field, the existence of interference signals may make the equipment unusable.

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  • Stray light jamming resistance photoelectric detecting system based on digital phase locking

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Embodiment Construction

[0016] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0017] see figure 1 , a kind of anti-stray light interference photoelectric detection system based on digital phase-locking in this embodiment includes a light source, a TTL signal generator, an optical modulator, a sensor, a preamplifier, a lock-in amplifier, a TTL signal generator or an optical modulator The light source is modulated, and the modulated light source and stray interference light are converted into output measurement signals and interference signals by the sensor. The measurement signals and interference signals are amplified by the preamplifier and sent to the lock-in amplifier. The lock-in amplifier is set to only Allows a measurement signal with the same frequency characteristics to pass through.

[0018] The detec...

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Abstract

The invention relates to a photoelectric detecting system, in particular to a stray light jamming resistance photoelectric detecting system based on digital phase locking. The system comprises a light source, a TTL signal generator, an optical modulator, a sensor, a pre-amplifier and a lock-in amplifier, wherein the TTL signal generator or the optical modulator perform modulation on the light source, a modulated modulation light source and stray jamming light are converted into output measuring signals and jamming signals through the sensor, the measuring signals and the jamming signals are transmitted to the lock-in amplifier after being amplified by the pre-amplifier, and the lock-in amplifier is set to be only allowed to be passed by the measuring signals with the same frequency characteristics as the lock-in amplifier. According to the system, the measuring signal-to-noise ratio can be remarkably improved, the measuring lower limit can be effectively expanded on the condition that the light source power is not increased, and the system is particularly applicable to a pollutant monitor with the weak measuring signals, and is also applicable to stray light suppression of other optical measuring instruments.

Description

technical field [0001] The present invention relates to a photoelectric detection system, more specifically to a digital phase-locked anti-stray light interference photoelectric detection system, which belongs to the field of environmental monitoring devices. Background technique [0002] With the increasingly stringent environmental protection laws and regulations, pollutant monitoring instruments such as dust concentration measuring instruments and polluting gas analyzers are developing in the field of ultra-low emission technology, and the requirements for the measurement lower limit and sensitivity of monitoring instruments are increasing day by day. more and more applications. The treatment of the interference of natural light in the measurement environment, other ambient lighting and other miscellaneous and astigmatic light determines the measurement signal-to-noise ratio of the monitoring instrument, and then determines the performance and technical level of the measu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01
CPCG01N21/01G01N2201/064G01N2201/062G01N2201/0612G01N2021/0112
Inventor 张虎苏江晨
Owner 西石(厦门)科技股份有限公司
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