Development and Performance of a Photoelectric Salt Concentration Sensor

The lack of medical salt aerosssol concentration detection method and instability powder atomization result in poor aerosol inhalation treatment effects. Considering medical vaporizer specific requirements, physical and chemical characteristics of salt powder commonly used, this paper analyzes salt particle light scattering using T-matrix method based on discrete source, calculated scattering intensity of salt particle with diameter of 0.4 to 6 μm, develops photoelectric salt aerosol concentration sensor with forward differential scattering light path and weak current signal conditioning circuits. Sensor salt aerosol concentration calibration experiments and performance tests was carried out, and the results show as follows: the maximum residuals of sensor is 0.262 mg/L in calibration experiments and relative error in performance tests was 12.9%, satisfied salt aerosol concentration detection requirements and could provide basis for on line stability control of aerosol concentration in medical salt powder atomization process.