Optical measurement cell and particle properties measuring instrument using the same

A batch type optical measurement cell used in a particle size distribution measuring instrument for measuring particle size distribution by detecting laser diffraction/scattered light, comprising:

• a pair of light transmitting plates respectively having opposite surfaces facing each other and containing fluid between the pair of opposite surfaces of the pair of light transmitting plates, and
• a sandwiching mechanism adapted to sandwich and hold the pair of light transmitting plates from the outside, wherein
• one opposite surface of the pair of opposite surfaces includes a spacer film deposited thereon that contacts with the other opposite surface to define a distance between the pair of opposite surfaces,
• each of the pair of light transmitting plates is made of glass allowing laser light transmission, and
• the sandwiching mechanism presses the pair of light transmitting plates uniformly over a circumferential direction.