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故障现象:一台日本阿洛卡SSD—720超声断层扫描仪图象出现固定空白故障,更换探头后故障消失。检修:该探头结构原理如图所示,它是一种摆动式机械扇形扫描器。扫描机头部的传感器在马达的作用下做往复运动以便声束作扇形扫描,而通过对电位器(与传感器中心轴相接)的余弦输出进行检波,就可以确定传感器的声束方向。由于故障现象是出现固定空白而其余图象正常,说明马达、传感器部件以及供电电源是正常的,很可能是电位器局部存在接触不良造成的。如更换探头,则需约四千美元。因此在用户的同意下笔者进行了
Symptoms: a Japanese Aoka SSD-720 ultrasonic tomography images appear blank fixed failure, replace the probe failure disappears. Maintenance: The principle of the probe structure as shown, it is a swing-type mechanical sector scanner. The sensor at the head of the scanner reciprocates under the action of the motor so that the sound beam scans a sector. By detecting the cosine output of the potentiometer (connected to the central axis of the sensor), the direction of the sound beam of the sensor can be determined. As a result of the fault phenomenon is a fixed blank and the rest of the image is normal, indicating that the motor, sensor components and power supply is normal, it may be caused by poor local potentiometer contact. If you change the probe, you need about four thousand US dollars. So under the consent of the user I conducted