A LOW-NOISE ELECTROMETER FOR AN AUTOMATED OEC MEASUREMENT SYSTEM

用于自动 OEC 测量系统的低噪声静电计

• 批准号: 3916199
• 负责人: H E CASCIO
• 金额: --
• 依托单位: DIVISION OF RESEARCH SERVICES
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3916199
• 关键词: biomedical automation; carbon dioxide; clinical biomedical equipment; computer program /software; electrodes; hemoglobin; human tissue; magnetic field; microelectrodes; monitoring device; oxygen microelectrode; oxygen tension; personal computers; radiowave radiation; respiratory oxygen

Measurement of the hemoglobin oxygen equilibrium curve (OEC) in an automated system is hampered by noise. To obtain reliable results in reading partial pressures with an accuracy of 0.01 mmHg requires special techniques in electronic circuit design. The P02, pH, and the PCO2 electrodes have -very high internal resistance with very low output signal levels. When these devices are used in an environment contaminated by radio frequency interference (RFI) from a computer, the magnetic fields of stepping motors, as well as power line transients generated by a high current water bath, the electrode output leads must be kept short and shielded. The electrode signals must be kept scaled and offset by a computer-controlled signal processor that properly interfaces these voltages to an AT-type personal computer, for further software analysis. Another task to be performed is the designing and fabrication of the required circuitry for the development of the automated system to perform the desired measurements.

在自动化测量仪中测量血红蛋白氧平衡曲线（OEC） 系统受到噪音干扰。为了获得可靠的阅读部分结果， 精确度为0.01 mmHg的压力需要特殊技术， 电子电路设计P02、pH和PC 02电极具有-非常 具有极低输出信号电平的高内阻。当这些 在受射频污染的环境中使用器械 干扰（RFI）从计算机，步进电机的磁场， 以及由高电流水浴产生的电力线瞬变， 电极输出引线必须保持短和屏蔽。电极 信号必须由计算机控制的信号保持缩放和偏移 处理器，其将这些电压适当地接口到AT型个人 计算机，用于进一步的软件分析。要执行的另一项任务是 开发所需电路的设计和制造 自动化系统进行所需的测量。