X线照片自动曝光电路的设计与应用

目的 为无自动曝光装置的Ｘ线设计一种摄影自动曝光控制电路，以改进设备性能，提高摄片质量。方法 采用串联控制方式，用射线传感器检测曝光过程中穿过人体到达胶体片的射线量，经积分、放大、比较等处理后，驱动执行机构，自动控制曝光时间。结果 该控制电路安装于国产Ｆ７８－Ⅲ型３００ｍＡ、Ｆ９９－ⅡｍＡ等Ｘ线机上，经６家医院实际应用，效果良好。结论 该设计结构简单，对Ｘ线机电路改动少，效果明显，具有实用价值。

Design and application of automatic exposure control circuit for filming

Objective To design an automatic exposure control circuit for X ray equipment to improve the performance of equipment and the quality of film. Methods The device acted in series control. During exposuring process,the X ray reaching the film through patient body was measured by ray sensor. After it was treated with integration, amplification and contrast management,the signal of X ray quantity drived the device to cut off exposure circuit, so that the exposure time was automatic any controlled. Results The effect of the device has been proved by its application in several hospitals. Conclusion The device is simple and effective and has practical value.