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本文阐述了利用相对法测量地物光谱反射率的原理及野外分光反射率计仪器系统的设计方法。采用先进的轨波稳零技术研制出了微电流放大计，并实现了测量结果的数字化，同时合理地设计和选取了单色仪和光电信增管（PMT），并制作了供PMT用的UPS负高压交直流两用电源。仪器系统灵敏度高，动态范围大，操作简单，便于野外使用，具有较高的性能价格比。
This article elaborates the principle of using the relative method to measure the spectral reflectance of the terrestrial object and the design method of the field spectrophotometer instrument system. Developed a micro-current amplification meter with advanced orbital zero-stop technique and realized the digitization of measurement results. At the same time, monochromator and optical telecom surge management (PMT) were rationally designed and selected, and a UPS for PMT Negative high voltage AC and DC power supply. High sensitivity instrument system, a large dynamic range, easy operation, easy to use in the field, with a high cost performance.