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公开(公告)号：US4859858A
公开(公告)日：1989-08-22
申请号：US24770
申请日：1987-03-11
CPC分类号： G01N21/3504 , A61B5/0836 , A61B5/097 , G01J3/108
摘要： Gas analyzers of the non-dispersive infrared radiation type which are designed to measure the concentration of one gas in a mixture of gases containing that gas. A novel, electrically modulated, stable, thick film infrared radiation emitter is employed to emit a beam of collimated, focused energy; and two electrically biased detectors are preferably used so that a ratioed, error eliminating output signal can be supplied to the failsafe, signal processing circuitry of the analyzer. The latter, and a conventional analog-to-digital convertor, supply information to a microcomputer which: (1) turns the infrared radiation emitter on and off; (2) controls a heater which keeps the infrared radiation detectors at a constant, precise temperature; and (3) controls displays of a variety of information concerning the gas being measured and the status of the gas analyzer. The microcomputer also accepts ambient temperature, barometric pressure, and other compensation factors. Typically, a disposable airway adapter will be included in the gas analyzer to confine the mixture of gases being analyzed to a path having a transverse dimension of precise and specific length and to provide an optical path across that stream of gases between the infrared radiation emitter and the infrared radiation detectors. The emitter and detectors are incorporated in a transducer head which can be detachably fixed to the airway adapter.
摘要翻译： 非分散型红外辐射型气体分析仪被设计用于测量含有该气体的气体混合气体中一种气体的浓度。 采用一种新颖的电调制稳定的厚膜红外辐射发射器来发射准直聚焦能量束; 并且优选地使用两个电偏置检测器，使得可以将比率的误差消除输出信号提供给分析仪的故障保护信号处理电路。 后者和传统的模拟 - 数字转换器向微型计算机提供信息：（1）打开和关闭红外辐射发射器; （2）控制加热器，其将红外辐射探测器保持在恒定的精确温度; 和（3）控制关于被测气体和气体分析仪的状态的各种信息的显示。 微型计算机还接受环境温度，气压和其他补偿因素。 通常，气体分析器中将包括一次性气道适配器，以将待分析气体的混合物限制在具有精确和特定长度的横向尺寸的路径上，并且在红外辐射发射器和 红外辐射探测器。 发射器和检测器结合在可拆卸地固定到气道适配器的换能器头部中。
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公开(公告)号：US4914720A
公开(公告)日：1990-04-03
申请号：US275014
申请日：1988-11-21
CPC分类号： A61B5/0836 , A61B5/097
摘要： Gas analyzers of the non-dispersive infrared radiation type which are designed to measure the concentration of one gas in a mixture of gases containing that gas. An infrared radiation emitter is employed to emit energy at a frequency of 40-100 Hz with a system which includes a source driver and a timer; and a detector is used to intercept the attenuated beam after it has passed through the mixture being analyzed and output a signal indicative of the concentration of the selected gas. Also, a second detector is preferably provided so that a ratioed, error eliminating output signal can be supplied to the failsafe, signal processing circuitry of the analyzer. The detectors are electrically biased by way of flyback transformer based circuitry to improve the signal-to-noise ratio, and the signal processing circuitry can be adjusted to compensate for drift. The detectors are mounted on a thermally conductive substrate along with appropriate filters, a filter frame, and a cover. The signal processing circuitry and an analog-to-digital convertor supply information to a microcomputer which: turns the infrared radiation emitter on and off and controls a heater which keeps the infrared radiation detectors at a constant, precise temperature. The microcomputer also supplies temperature, barometric pressure, and other compensation factors. Typically, a disposable airway adapter with an elongated, flanged casing will be included in the gas analyzer to confine the gases being analyzed to a path having a transverse dimension of precise and specific length and to provide an optical path across that stream of gases between the infrared radiation emitter and the infrared radiation detectors. The emitter and detectors are incorporated in a transducer head which has a U-shaped recess and can be detachably fixed to the airway adapter with a detent arrangement.This application is a continuation of application Ser. No. 146,284 filed Jan. 20, 1988 (now abandoned). U.S. application Ser. No. 146,284 is a division of application Ser. No. 024,770 filed Mar. 11, 1987 (now U.S. Pat. No. 4,859,858). Application Ser. No. 024,770 is a continuation-in-part of application Ser. No. 938,030 filed Dec. 4, 1986, by Daniel W. Knodle et al. and entitled GAS ANALYZERS (now abandoned).
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公开(公告)号：US5206511A
公开(公告)日：1993-04-27
申请号：US600413
申请日：1990-10-18
申请人： Jerry R. Apperson , Paul K. Graham , Leslie E. Mace , James T. Russell , Lawrence L. Labuda , Walter A. Cooke
发明人： Jerry R. Apperson , Paul K. Graham , Leslie E. Mace , James T. Russell , Lawrence L. Labuda , Walter A. Cooke
CPC分类号： G01N21/3504 , G01N21/274
摘要： A method of and device for calibrating infrared radiation transducers. A concentration factor representing the ratio of a data signal to a reference signal for a known concentration of a designated gas in a sample containing that gas is generated. The concentration factor is stored and used during subsequent calibration procedures. The calibration device has a zero cell and a span cell with windows for transmitting infrared radiation and radiation reflecting or absorbing material in the span cell. The span cell therefore provides a known and consistent level of radiation absorption.
摘要翻译： 用于校准红外辐射换能器的方法和装置。 产生表示含有该气体的样品中已知浓度的指定气体的数据信号与参考信号之比的浓度系数。 浓度因子在随后的校准过程中被储存和使用。 校准装置具有零电池和带有窗口的跨距电池，用于传送红外线辐射和辐射反射或吸收跨距电池中的材料。 因此，跨距单元提供已知且一致的辐射吸收水平。
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公开(公告)号：US4859859A
公开(公告)日：1989-08-22
申请号：US24769
申请日：1987-03-11
申请人： Daniel W. Knodle , William E. Crone
发明人： Daniel W. Knodle , William E. Crone
CPC分类号： G01J3/108 , A61B5/0836 , A61B5/097 , G01J3/02 , G01J3/0286 , G01N21/3504 , A61M16/04 , A61M2016/102 , G01J2001/182 , G01N2021/3166 , G01N2201/06186 , G01N2201/1218
摘要： Gas analyzers of the non-dispersive infrared radiation type which are designed to measure the concentration of one gas in a mixture of gases containing that gas. A novel, electrically modulated, stable, thick film infrared radiation emitter is employed to emit a beam of collimated, focused energy; and two electrically biased detectors are preferably used so that a ratioed, error eliminating output signal can be supplied to the failsafe, signal processing circuitry of the analyzer. The latter, and a conventional analog-to-digital convertor, supply information to a microcomputer which: (1) turns the infrared radiation emitter on and off; (2) controls a heater which keeps the infrared radiation detectors at a constant, precise temperature; and (3) controls displays of a variety of information concerning the gas being measured and the status of the gas analyzer. The microcomputer also accepts ambient temperature, barometric pressure, and other compensation factors. Typically, a disposable airway adapter will be included in the gas analyzer to confine the mixture of gases being analyzed to a path having a transverse dimension of precise and specific length and to provide an optical path across that stream of gases between the infrared radiation emitter and the infrared radiation detectors. The emitter and detectors are incorporated in a transducer head which can be detachably fixed to the airway adapter.
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