| 摘要 |
PROBLEM TO BE SOLVED: To realize a measurement responsive to high rate variation in the quantity of scattering light while suppressing the effect of optical noise by measuring a specific instantaneous value, the peak value of an electric signal, corresponding to the quantity of scattering light in synchronism with the period of irradiating light. SOLUTION: The equipment for measuring the quantity of scattering light being employed as a range finder, a roughness meter, a chrominance meter or an optical absorption meter comprises a laser diode light source LS for irradiating a light scattering part P1 with a light IL at a quantity of light Q varying at a period T and a frequency f, and a photodiode PD for converting a part of a scattering light S entering through an optical fiber F into a current. Output current from the photodiode PD is passed through a bandpass filter BF of frequency f and amplified to produce a voltage signal Vm and the instantaneous values V1, V2,... at the peak points W1, W2,... of the voltage signal Vm synchronized with the peak points m1, m2,... of the quantity of irradiating lightΦare measured as the quantity of scattering light. The shape at the light scattering part can be observed when an image processor is provided.
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