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    • 80. 发明专利
    • APPARATUS FOR MEASURING DENSITY, CONCENTRATION, SPECIFIC GRAVITY AND THE LIKE OF LIQUID
    • JPS58169050A
    • 1983-10-05
    • JP5283482
    • 1982-03-31
    • NIPPON BEET SUGAR MFG
    • TAKEDA REIJIOIKAWA SHIYOUZOU
    • G01N9/24G01N21/41G01N21/43
    • PURPOSE:To accurately measure the density, concentration, specific gravity and the like of a liquid, by forming the interfacial wall into a circular shape thereby to prevent the attenuation of measuring light as much as possible. CONSTITUTION:When a sucrose solution as a liquid 1 to be measured has a concentration of 0%, all the rectilinearly propagating measuring lights entering through a light entering port 3 are totally reflected by the section of a circular interfacial wall 5 between points Q and P and passed through a light-receiving port 4 and then received by a light-receiving element 8. In this case, the quantity of the reflected light is maximum. As the sucrose solution increases in concentration, the critical angle (alpha) determined by a light-transmitting substance 2 and the liquid 1 becomes larger, so that the region in the QP part of the interfacial wall 5 where the incident angle is larger than the critical angle decreases. In consequence, the measuring lights become unable to satisfy the total reflection conditions successively from the measuring lights closer to the rectilinearly propagating light L, resulting in a reduction in quantiy of the light received by the light-receiving element 8. Thus, if the electromotive force generated by the element 8 is previously obtained for each concentration, an unknown concentration can be accurately measured by employing this apparatus.