An Inexpensive, Low-Maintenance, Precision Amplifier, Dissolved Oxygen Sensor, and Miniature Data Logger System Designed for Long-Term Deployment in Riverine Systems

（一种廉价的，低维护，精密放大器，溶解氧传感器，微型和数据记录系统，设计用于长期部署在河流系统。）

文献：

DOI:

10.1577/T08-011.1

• Received: 16 Jan 2008
• Accepted: 22 Oct 2009
• Published online: 09 Jan 2011

• Abstract

  The dissolved oxygen (DO) concentration is a dynamic water quality variable that is critical to fisheries. To obtain simultaneous DO data at 15-min intervals over long periods (i.e., months) at a number of points along a river, a simple, inexpensive (<US$40) differential voltage amplifier circuit was developed to provide an interface between a galvanic DO probe and a miniature data logger. The circuit is designed around precision, micropower, single-voltage supply operational amplifiers and consumes less than 3 W while isolating and amplifying the output of a galvanic DO probe. The circuit is efficient and rapid enough to be powered by the data logger's 2.5-V, 1-mA, 18-ms-read sensor trigger signal. The complete unit, including the enclosure and floats, was constructed for less than $700. Fourteen were deployed in the upper portion of the St. Johns River, Florida, over an 18-month period. The units remained continuously deployed for 4- to 6-month periods 82% of the time, and 93% of the collected data passed quality assurance tests.

  摘要
  溶解氧（DO）浓度是一个动态的水质变量，对渔业而言非常关键。按照15分钟的时间间隔，在某一数量的点，沿河流布置，长周期（几个月）运行。一种简单，廉价的差动电压放大器电路的开发，提供一个DO探头和一个微型的数据之间的接口同时进行数据记录仪。该电路的设计是围绕精密，微功耗，单电源运算放大器，功耗小于3瓦，而隔离和放大电流的输出DO探头。电路是有效的，并足够迅速由数据记录器获得2.5-V，1-毫安，18毫秒的读传感器的触发信号。完整的单元，包括外壳，构建了不到700 $。部署在圣约翰河，佛罗里达州的上部，在18个月内。单位仍然连续部署4-至6个月的时间段的82％的时间，并通过质量保证测试所收集的数据的93％。