基于手机模块的油井工况远程监控系统开发与应用

华北油田部分抽油机井地处偏远,分布分散,出现临时停电、故障停机、皮带烧毁等问题不易发现,造成处理不及时,严重影响了开井时率,降低了原油采收率。为实现员工有效监控抽油机运行工况,开发了手机远程监控系统。该系统由远程控制模块、供电模块、无线传输模块、手机终端等组成,能够方便一线员工快速监控油井运行参数,及时发现抽油机故障,减少安全隐患,为绿色矿山建设提供了有力的技术支持。     

一种用于微机械惯性传感器中的16位ΣΔ调制器

A fourth-order low-distortion low-pass sigma-delta （∑△） modulator is presented for micro-machined inertial sensors. The proposed single-loop single-bit feedback modulator is optimized with a feed-forward path to decrease the nonlinearities and power consumption. The IC is implemented in a standard 0.6 μm CMOS technology and operates at a sampling frequency of 3.846 MHz. The chip area is 2.12 mm^2 with 23 pads. The experimental results indicate a signal-to-noise ratio （SNR） of 100 dB and dynamic range （DR） of 103 dB at an oversampling rate （OSR） of 128 with the input signal amplitude of-3.88 dBFS at 9.8 kHz; the power consumption is 15 raW at a 5 V supply.