微型比色计在工农业现场的快速定量分析中,具有很大用处。本文对此课题进行了研究和分析。做了一些理论推导和实验测试。一、单色光源的选择钨丝灯泡属连续全光谱型光源。由于其体积较大,相对红外辐射强度比较高,从而造成单色滤光效果不很理想。另外,电路恒电压或恒电流供电都难以使光源强度得到稳定。针对这些问题,我们采用半导体固体发光器件——发光二极管作为单色光源。它的发光是由固体内部导带载流子受激,进行能级跃迁所产生的。因此,发光的单色性较好,半波峰宽一般要小于5nm,优于干涉滤光片的滤光效果。再则它的电功耗 Micro-colorimeter in the rapid quantitative analysis of industrial and agricultural field, with great usefulness. This article has carried on the research and the analysis to this subject. Made some theoretical deduction and experimental testing. First, the choice of monochromatic light source Tungsten light bulb is a continuous full spectrum type light source. Because of its larger size, the relative intensity of infrared radiation is relatively high, resulting in monochromatic filter effect is not very satisfactory. In addition, the circuit constant voltage or constant current power supply are difficult to stabilize the light intensity. In response to these problems, we use semiconductor solid light emitting devices - light-emitting diodes as a monochromatic source. Its luminescence is generated by the conduction of energy carriers within the conduction band of solid conduction band. Therefore, the light-emitting monochromatic better half-wave width is generally less than 5nm, better than the interference filter filter effect. Then it’s electricity consumption