System for controlling temperature of continuous laser particle analyzer

Abstract

The invention provides a system for controlling the temperature of a continuous laser particle analyzer, which is used for temperature control of an avalanche photo diode (APD) fluorescent detection part in the continuous laser particle analyzer. The system comprises a heat insulation shell, a triethyl citrate (TEC) refrigerator, a thermistor and a control device. The TEC refrigerator is used for regulating the temperature of the APD; the thermistor is used for detecting the temperature of the ADP; and the control device is used for monitoring and controlling. The system meets the requirement of precise temperature control, can be used for heating and refrigerating, has short response time and is flexible and convenient to use.

Description

technical field [0001] The invention relates to an instrument for simultaneously analyzing the size and fluorescence intensity distribution of aerosol particles in an air sample by using the laser scattering characteristics and the fluorescence characteristics of biological particles, and monitoring and giving early warnings for suspicious microbial particles in the air samples in real time. Background technique [0002] Biological pathogenic substances spread through the air in the widest range and are the most harmful. There are all kinds of suspended particles in the air, including non-biological particles, biological particles, and complexes of biological particles and non-biological particles adsorbed together. The inhalable particles can enter the human respiratory system and deposit in the nose. Pharynx, trachea, bronchi, bronchioles, alveoli, and through the action of phagocytes, these particles can be transported to other organs through the blood, causing various di...

AI Technical Summary

Problems solved by technology

The problem of this instrument is that the energy of the pulsed laser changes with the change of the trigger frequency, the energy is unstable, the detected analog signal is weak, it is easily interfered by other signals, and the signal-to-noise ratio is poor; in addition, its structural design makes the equipment The volume is large, it is not convenient to use in vehicles or other mobile places

[0004] The APD temperature control part of the aerosol particle laser analyzer disclosed in this invention patent uses the characteristics of the APD to change its operating voltage when its temperature changes, so that the detection results of the APD are accurate and effective, but there is no difference between the temperature and voltage of the APD. Very good linear relationship, and the change of its working voltage is limited, so the detection results of APD cannot be very accurate

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