目前用于脉象研究的换能器种类很多,工作原理和性能指标也各不相同。本文介绍的HMX-3C型脉象换能器是刚体触头,利用等截面弹簧片悬臂梁作为传感元件,半导体应变片作为应变-电压转换元件的脉象换能器。换能器主体采用表式结构,使用时不仅放置固定方便,还可以大大减低由于受试者体位和手臂扰动而引起的干扰信号,能够长时间稳定地检测脉搏波形。为使换能器的性能及操作方法尽可能符合中医切脉的传统习惯,采用了两个用细纹螺杆调节的精细拖扳装置,使换能器触头的定位位置可任意调正,浮中沉取法压力连续可调,并能用克力或毫米汞柱为单位标定。由于一般脉象换能器临床应用时重复性差,对放置位置精度要求过 At present, there are many types of transducers used in pulse studies, and their working principles and performance indexes are also different. This article describes the HMX-3C pulse transducer is a rigid body contact, the use of isosceles cantilever as the sensing element, the semiconductor strain gauge as a strain - voltage conversion element pulse transducer. Transducer body structure using the table, not only when used to place a fixed convenience, but also can greatly reduce the subject position and arm disturbance caused by the interference signal, the stability of the pulse waveform can be detected over a long period of time. In order to make the performance and operation method of the transducer accord with the traditional habit of cutting the veins of Chinese medicine as far as possible, two fine pulling devices adjusted by the fine-grained screws are used to make the positioning position of the transducer contact be adjusted freely. The desalting pressure is continuously adjustable and can be calibrated in grams of force or millimeters of mercury. Due to the general poor reproducibility of pulse transducer in clinical applications, the accuracy of the placement position is too high