基于通用串行总线的测井脉冲采集电路研究

设计了一种基于通用串行总线（USB）技术的测井脉冲信号采集系统。该系统用深度子系统驱动测井脉冲的采集，并配备了PCM遥测信号接口。系统设计包括硬件设计、单片机固件设计以及设备驱动程序和用户应用程序设计。硬件设计中用复杂可编程逻辑器件完成对脉冲采集过程中脉冲放大倍数和峰值保持电路电容充放电的控制，并检测出PCM遥测信号的同步帧，同时进行遥测数据的串并转换，节省了单片机资源。单片机控制测井脉冲采集的整个过程，并实现USB通信，在主机请求数据时发送数据。系统在实验室调试成功，数据传输速率达到300kb／s，控制逻辑灵活，可扩展升级。

Reseach of well logging pulse data acquisition circuit based on universal serial bus

A kind of well-logging pulse data acquisition system based on universal serial bus(USB) was designed.The well logging pulse data acquisition is driven by depth sub-system.And pulse code modem(PCM) telemetry interface is remained in the system.The system is composed of hardware design of chip microprocessor,firmware design of chip microprocessor,device driver and application software design.In hardware designing,complex programmable logic device(CPLD) is used to control the gain of pulse signal and the discharge switch of peek-value holding circuit during pulse data acquisition,and is used to check out synchronous frame of PCM signal and convert the serial signal data to parallel data,which save system resource of chip microprocessor. Chip microprocessor controls the whole course of well logging pulse data acquisition system,and realizes USB communication,sends data to host computer when being required.The system passed examination in laboratory.Its transmission speed is up to 300 kb/s,and its control function is flexible.Also,the system can be extended easily.