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本文介绍了FM-1型光纤微机测碘仪定量数学关系,光导纤维传感器结构及仪器系统设计.确定了在动力学催化比色法中,碘离子浓度与透光率对时间的一阶导数T＇之间的抛物线关系,即C=aT＇~2+bT＇+c。溶液中碘离子浓度在0.5～100μg/L范围内的抛物线关系良好。光导纤维传感器将光学量转换成光电压,该电压输入486微机模拟信号采集系统并转换成数字量由计算机进行处理.该系统在软件支持下工作,分析速度为30s/次。对10μg/L碘溶液连续11次测定的变异系数为2.09％。吸光度A和透光率T的最小分度值为0.0001A和0.01T(％)。
This paper introduces the quantitative mathematical relationship between FM-1 optical fiber microcomputer Iodine Measuring Instrument, the structure of optical fiber sensor and the design of instrument system.It is confirmed that in the kinetic catalytic colorimetry, the first derivative of the iodine ion concentration and the light transmittance to the time T Parabolic relationship between the ’C = aT’ ~ 2 + bT ’+ c. The parabolic relationship between the concentration of iodide in solution and the range of 0.5 ~ 100μg / L was good. The optical fiber sensor converts the optical quantity into a photovoltaic voltage, which is input to a 486 microcomputer analog signal acquisition system and converted into a digital quantity for processing by a computer. The system works with software support at an analysis speed of 30s / second. The coefficient of variation for 11 consecutive determinations of 10 μg / L iodine solution was 2.09%. The minimum graduation values of absorbance A and light transmittance T are 0.0001 A and 0.01 T (%).