| 摘要 |
The apparatus comprises a cell 2 containing the sample 1 under investigation. Electromagnetic waves P1,P2 are applied from opposite directions and interfere with one another in the region of the cell to form a standing wave pattern 6. DUe to electrostriction effects the standing wave pattern causes particles within the sample to concentrate in certain areas in a pattern corresponding to that of the standing wave 6. This pattern of particle concentration forms a grating when seen by an input wave Pin of electromagnetic wave radiation and, provided conditions are correct, results in the generation of a phase conjugate wave Pout. Means (not shown) are provided for measuring the intensity of the phase conjugate wave Pout which gives a sensitive measure of the size of the particles suspended in the sample.
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