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测谎仪只有一本32开的书本大小。它由传感器、主机和微机三部分组成。传感器有三个触角:戴在人手指上的皮肤电传感器,用来测量皮肤电阻的变化;呼吸传感器系在人体的胸部,测量人呼吸的变化;脉搏和血压传感器,戴在人腕部或臂部,测量人体脉搏和血压的变化。主机的作用是将传感器采集的模拟信号经过处理制成数字信号,输入计算机进行存储、分析。
The polygraph only has a 32-book size. It consists of three parts: sensor, host computer and microcomputer. The sensor has three antennae: a skin electrical sensor worn on the person’s finger to measure changes in the skin’s electrical resistance; the respiratory sensor is attached to the body’s chest and measures changes in human respiration; the pulse and blood pressure sensor is worn on the person’s wrist or arm , measure changes in human pulse and blood pressure. The role of the host is to process the analog signals collected by the sensors into digital signals and input them into the computer for storage and analysis.