background

In the laser particle size test, the background is a fixed optical signal formed on the detector after the laser passes through the sample cell and the pure medium. The main reason for the background is the refraction and reflection phenomena that occur when the laser enters the sample cell glass (front), the medium, the sample cell glass (rear) and returns to the air from the air, plus the possibility of the sample cell glass, medium and lens It is caused by the comprehensive effect of micro-pollution. The purpose of measuring the background is to deduct these fixed and sample-independent signals during the particle size test, eliminate the influence of factors other than the scattered light of the sample on the measurement results, and ensure the accuracy and reliability of the measurement results.