数码开关控制测光的装置

A Device for Digital Switch Controling Measure Light

在发射光谱分析中,传统使用测微光度计测光,必须转动手轮,使光度计镜头扫描谱线,以测得黑度。现在虽有谱线黑度值直读入微机内存的装置,但还需靠人工转动手轮,实难做到均匀转动。由于光度计扫描谱线的速度有快慢之分,对同样样品浓度,黑度值就不尽相同。

Step Motor is driven by clock pulse, which is produced from Dual Timer 556, and its frequency is determined by external timing resistor and capacitor. Synchronous BCD up counters apply Synchronous Stage Link. Digital Switchs control sweep, pulse distributor CH250 controls motor's rotation or contrarotation.