Sensors and methods for high-sensitivity optical particle counting and sizing

Sensors and methods for high-sensitivity optical particle counting and sizing

  • CN 1,682,105 B
  • Filed: 06/18/2003
  • Issued: 02/26/2014
  • Est. Priority Date: 07/17/2002
  • Status: Active Grant
First Claim
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1. for the particle of convection cell suspension, carry out the sensor device of individual particle optical dimensions measurement, comprise:

  • Make the device of the mobile measurement flow channel by physically explication of described suspension;

    Thereby the arrow beam of light that effective guiding has axis forms the irradiation unit in optical sensing region in described measurement flow channel by described measurement flow channel, described light beam and described optical sensing region have such size with respect to the size of described measurement flow channel, make described sensor device only in response to the part flowing through in whole particles of described measurement flow channel, described sensor device is effectively in response to dense fluid suspended thing thus, described light beam has maximum intensity part and for the position that partly starts to separate in the direction perpendicular to described axis from described maximum intensity, has the intensity weakening continuously, some in described particle have by the track of described maximum intensity part thus, and other of described particle have by described intensity compared with the track of weak part, and described particle also has some may have the track outside described region,For thereby the light from described region is carried out to the detector assembly that photodetection provides pulse height signal, wherein each pulse height signal is in response to the particle that flows through described region, described pulse height signal is the size of tested particle and the function of track, the particle of intended size provides maximum impulse altitude signal when flowing through the described maximum intensity part in described region, and describedly providing weak pulse height signal during compared with weak intensity part when what flow through described region, described pulse height signal jointly forms pulse height distribution PHD;

    AndFor described pulse height is distributed on mathematics and launches convolution to therefrom extract the device of the particle size distribution PSD of particle described in described fluid suspended thing.

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