• Title/Summary/Keyword: Oxygen sensor

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A Method on the Temperature Compensation for the Oxygen Electrode for DO Sensor (DO 센서용 산소전극의 온도보상에 대한 일 방안)

  • Rhie, Dong-Hee;Choi, Bok-Gil
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.376-378
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    • 1995
  • A method is presented for the design and fabrication of the temperature compensation circuits on the Clark electrodes for measuring the dissolved oxygen(DO) concentration. The discussion includes a method of the sensor interface circuits for the DO sensor. Typical polarograms for the DO probes under test using this sensor circuits are presented. High accuracy over 99 % of the I to V conversion using the proposed circuit is verified. Temperature dependence for the test DO probe is well compensated automatically using the thermistor($2k\Omega,\;25^{\circ}C$) in series with correction resistor in the feedback loop of the op-amp circuit in the temperature range of the 0-50$^{\circ}C$.

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Development of the Measurement System for the Multi-Functional DO Sensor (다기능 DO 센서용 계측시스템 개발)

  • 이동희;김태진;최복길
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.11a
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    • pp.86-88
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    • 1996
  • A method is presented for the development of the PC-based measurement system on the 6 cathodes-single anode type multi-functional oxygen electrodes for detecting various components of the solution by measuring the dissolved oxygen(DO) concentration. The system is consisted with the 6 channel sensor signal modyfing circuits for the sensor and the PC interface circuits using the single chip microprocessor 80c196kc. Typical polarograms for the DO probes under test using this sensor circuits are presented. This system covers wide range of measuring time from 300sec to over 16 hour in one measurement step by programming the 9 monitor disply mode.

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A Method on the design of the Sensor Circuits for the polarographic Oxygen Probes (Polarographic 산소전극용 센서회로 설계에 대한 일 방안)

  • Rhie, Dong-Hee;Choi, Bok-Gil;Kim, Nam-Jeong;Kang, Mun-Ho
    • Proceedings of the KIEE Conference
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    • 1994.07b
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    • pp.1286-1288
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    • 1994
  • Methods are described for the design and fabrication of the sensor circuits on the polarographic oxygen sensing electrodes. The discussion includes: a method for the +5V single-supply driving for the sensor circuits, a method of low power comsumption for the front-end electronics. Typical polarograms for the commercial DO probes using this sensor circuits are presented. High accuracy of the I to V conversion using the circuits is verified.

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Development of Oxygen Sensor for the Oxygen Concentration Measuring of Air-fuel Ratio Measuring System (공연비 측정시스템의 산소농도 측정을 위한 센서 개발)

  • Lee, Jin-Hui;Choi, Ko-Yeol;Jang, Hyang-Dong;Kim, Yang-Soo;Cho, Dong-Hoe;Park, Myon-Yong;Chung, Koo-Chun;Cho, Jin-Weon
    • Analytical Science and Technology
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    • v.12 no.6
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    • pp.472-477
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    • 1999
  • It was developed the oxygen sensor of air-fuel ratio measuring system that was controlled the needed air amounts in optimum combustion according to the analysis of oxygen concentration of exhaust gas. The oxygen sensor was prepared by using gold as cathode, which the detection range for the oxygen concentration was from 0.0% to 30.0%. Response time was observed 15 to 20 sec. rapidly and selectively. It was appeared a good result in reproducibility and stability.

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Analog Front-End Design Techniques and Method for Saturation of Hemoglobin with Oxygen Sensor (센서 기반 헤모글로빈의 산소 포화도 측정을 위한 아날로그 프런트 엔드 설계 기술 및 방법)

  • Park, Sejin;Lee, Hokyu;Park, Jongsun;Kim, Chulwoo
    • Journal of IKEEE
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    • v.18 no.1
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    • pp.172-178
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    • 2014
  • This paper describes the design technique and the method of analog front-end to measure the saturation of hemoglobin with oxygen sensor. To process the $SpO_2$ value from the sensor, the current data from the sensor should be converted into voltage domain. Designed analog front-end usually converts the current data from the sensor into voltage domain data to pass it on analog-to-digital converter called ADC with a different level of gain characteristics. This circuit was fabricated in a $0.11{\mu}m$ CMOS technology and has 4 level of gain properties. The occupied area is $0.174mm^2$.

Experimental Study on the Flue Gas Phenomena in Infrared Mobile Heaters (이동식 적외선 가스히터의 배기가스현상에 대한 실험적 연구)

  • 김영규;류근준
    • Journal of the Korean Society of Safety
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    • v.11 no.3
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    • pp.119-125
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    • 1996
  • The experimental work is performed to obtain content levels and characteristics of flue gas in infrared mobile heaters for butane gas with varying the chamber size and its room temperature. The results showed that the oxygen depletion sensor device is operated at 18.3% of oxygen content. And the relation of oxygen content and carbon dioxide content in an enclosed space show linear aspect, but the content rate of carbon monoxide occurs at random without the level of oxygen content and carbon dioxide content.

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Cerebral blood flow enhancement device using Blood Oxygen Level Sensor (Blood Oxygen Level Sensor를 이용한 대뇌혈류증가 장치)

  • Lim, Jung-hyun;Joh, In-Hee;Kim, Young-kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.8
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    • pp.1083-1089
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    • 2018
  • Surgery to increase cerebral blood flow is one of the treatment methods of cerebral infarction. In order to supplement this invasive method, non-invasive devices have been introduced that use human blood pressure to pressurize the extremities to increase cerebral blood flow. However, the problem of poor speed and accuracy was raised. In this paper, the perfusion index of each arm is measured by applying pressure to both arms using Blood Oxygen Level Sensor to improve the accuracy of measurement and measurement time. The pressure applied to the arm is calculated by using the pressure value obtained from the arm. Like the existing blood pressure measuring cerebral blood flow increasing device, the blood flow can be increased by more than 20% and the measurement time can be shortened, so that it can be selectively used for the patient with cerebral infarction.

Monitoring bridge scour using dissolved oxygen probes

  • Azhari, Faezeh;Scheel, Peter J.;Loh, Kenneth J.
    • Structural Monitoring and Maintenance
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    • v.2 no.2
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    • pp.145-164
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    • 2015
  • Bridge scour is the predominant cause of overwater bridge failures in North America and around the world. Several sensing systems have been developed over the years to detect the extent of scour so that preventative actions can be performed in a timely manner. These sensing systems have drawbacks, such as signal inaccuracy and discontinuity, installation difficulty, and high cost. Therefore, attempts to develop more efficient monitoring schemes continue. In this study, the viability of using optical dissolved oxygen (DO) probes for monitoring scour depths was explored. DO levels are very low in streambed sediments, as compared to the standard level of oxygen in flowing water. Therefore, scour depths can be determined by installing sensors to monitor DO levels at various depths along the buried length of a bridge pier or abutment. The measured DO is negligible when a sensor is buried but would increase significantly once scour occurs and exposes the sensor to flowing water. A set of experiments was conducted in which four dissolved oxygen probes were embedded at different soil depths in the vicinity of a mock bridge pier inside a laboratory flume simulating scour conditions. The results confirmed that DO levels jumped drastically when sensors became exposed during scour hole evolution, thereby providing discrete measurements of the maximum scour depth. Moreover, the DO probes could detect any subsequent refilling of the scour hole through the deposition of sediments. The effect of soil permeability on the sensing response time was also investigated.

A study for measurement of radial artery oxygen saturation system using photoelectric plenthysmography (광전용적맥파를 이용한 요골동맥 산소포화도 측정 시스템의 연구)

  • Kim, Kyung-Ho
    • Journal of the Korea Society of Computer and Information
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    • v.15 no.3
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    • pp.11-18
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    • 2010
  • In this study, the pulse of radial artery and oxygen saturation are detected using photoelectric plethysmograph method. Using our device designed reflection type, we can detect the reflected light by radial artery and by switching circuit, we can also separate to 625nm band signal and 940nm band signals. The separated signals are converted as a pulse data by the pulse signal processing circuit. In this study, the reflection type of oxygen saturation calculation method is applied instead of the transmission type because of the reflection type sensor is used to measure the radial artery. As a result, we can detect about 97% accuracy of the oxygen saturation compare with the conventional method. For the accurate signals, the wrist band with sensor was designed and fixed on the radial artery. As a result, this wrist band type sensor was applicable to prevent position errors from motion artifact and could increase the accuracy during the measuring.

Development a glucose-FIA system with a fiber optic oxygen sensor

  • Sohn, Ok-Jae;Lam, Tuan-Hung;Rhee, Jong-Il
    • 한국생물공학회:학술대회논문집
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    • 2005.10a
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    • pp.730-734
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    • 2005
  • Flow injection analysis (FIA) system was developed to monitor glucose concentrations in biotechnological processes. A fiber optic oxygen sensor was used to determine consumption of oxygen concentration by reaction of immobilized glucose oxidase (GOD). The GOD was immobilized on VA-Epoxy carrier and integrated into FIA system. A calibration curve for glucose was obtained in the range of 0.5 $g/L{\sim}3.0$ g/L.

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