Design of a Photoelectric Detection Circuit in Particle Analysis Apparatus for Clinical Liquid Sample

Based on side lateral scattering technique, a particle analysis apparatus for clinical liquid sample provided a precise and accurate method to acknowledge and transversely compare the particle properties at the micro-level. To improve the detection capability and lessen the lower detection limit of particle size, a photoelectric detection circuit including two parts of pre-amplifier and noise reduction was designed in accordance with the properties of lateral scattering signals. The circuit has the characteristics of working stable at high frequency band, high SNR and wide dynamic input range. Experiments show that the apparatus with the circuit mentioned can detect 0.3μm particle effectively and has broad application prospects in differential blood count, injection quality control and many other areas.