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

（一種廉價(jià)的，低維護(hù)，精密放大器，溶解氧傳感器，微型和數(shù)據(jù)記錄系統(tǒng)，設(shè)計(jì)用于長(zhǎng)期部署在河流系統(tǒng)。）

文獻(xiàn)：

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）濃度是一個(gè)動(dòng)態(tài)的水質(zhì)變量，對(duì)漁業(yè)而言非常關(guān)鍵。按照15分鐘的時(shí)間間隔，在某一數(shù)量的點(diǎn)，沿河流布置，長(zhǎng)周期（幾個(gè)月）運(yùn)行。一種簡(jiǎn)單，廉價(jià)的差動(dòng)電壓放大器電路的開(kāi)發(fā)，提供一個(gè)DO探頭和一個(gè)微型的數(shù)據(jù)之間的接口同時(shí)進(jìn)行數(shù)據(jù)記錄儀。該電路的設(shè)計(jì)是圍繞精密，微功耗，單電源運(yùn)算放大器，功耗小于3瓦，而隔離和放大電流的輸出DO探頭。電路是有效的，并足夠迅速由數(shù)據(jù)記錄器獲得2.5-V，1-毫安，18毫秒的讀傳感器的觸發(fā)信號(hào)。完整的單元，包括外殼，構(gòu)建了不到700 $。部署在圣約翰河，佛羅里達(dá)州的上部，在18個(gè)月內(nèi)。單位仍然連續(xù)部署4-至6個(gè)月的時(shí)間段的82％的時(shí)間，并通過(guò)質(zhì)量保證測(cè)試所收集的數(shù)據(jù)的93％。