WO1993003666A1 - Thermometre infrarouge et son procede d'etalonnage - Google Patents

Thermometre infrarouge et son procede d'etalonnage Download PDF

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Publication number
WO1993003666A1
WO1993003666A1 PCT/US1992/006939 US9206939W WO9303666A1 WO 1993003666 A1 WO1993003666 A1 WO 1993003666A1 US 9206939 W US9206939 W US 9206939W WO 9303666 A1 WO9303666 A1 WO 9303666A1
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WO
WIPO (PCT)
Prior art keywords
sensor
temperature
infrared
target
signal
Prior art date
Application number
PCT/US1992/006939
Other languages
English (en)
Inventor
Kerry O. Banke
Original Assignee
Diatek, Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diatek, Incorporated filed Critical Diatek, Incorporated
Publication of WO1993003666A1 publication Critical patent/WO1993003666A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G01J5/049—Casings for tympanic thermometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
    • G01J5/064—Ambient temperature sensor; Housing temperature sensor; Constructional details thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
    • G01J5/12—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
    • G01J5/14—Electrical features thereof
    • G01J5/16—Arrangements with respect to the cold junction; Compensating influence of ambient temperature or other variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/80—Calibration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer

Definitions

  • This invention relates generally to infrared thermometers and, more particularly, to calibration systems for such thermometers.
  • Infrared thermometers have a number of desirable qualities, such as the ability to measure a person's body temperature in a fraction of a second and to provide readings without requiring the person to lie still for an extended time. In addition, such thermometers are generally easy to use and have a relatively low risk of infection in normal usage. These qualities make infrared thermometers especially popular in hospital and clinical settings, where they can be used to quickly and reliably determine the body temperatures of many patients under generally sanitary conditions.
  • Infrared thermometers use an infrared sensor, or a thermopile, that generates an electrical current signal that varies in accordance with the temperature of a target placed in front of the sensor.
  • Such sensors have a cold junction and a hot junction.
  • the hot junction is the portion of the sensor that is exposed to the target whose temperature is to be measured, while the cold junction is the portion of the sensor that is isolated from the target.
  • the sensor signal indicates any difference between the temperature of the cold junction and the temperature of the target.
  • thermometers adapted to measure a patient's body temperature
  • a probe is typically inserted into the patient's ear canal and directed toward the tympanic membrane, or eardrum, such that infrared radiation from the eardrum impinges on the hot junction of the sensor.
  • the eardrum temperature which is generally an accurate indication of the patient's body temperature, can then be calculated by adding the temperature difference indicated by the sensor output signal to the sensor's cold junction temperature.
  • the accuracy of the calculated temperature is affected by the accuracy with which the cold junction temperature is determined. Therefore, the cold junction must be maintained at a precisely controlled temperature, or the cold junction temperature must in some other way be accurately determined. It is usually more convenient to determine the temperature of the cold junction and provide temperature compensation than it is to maintain the cold junction at a controlled point.
  • Various systems have been used for determining the temperature of the cold junction.
  • the cold junction is assumed to be at ambient temperature and a separate thermometer or an operator input is used to specify the ambient temperature. Such systems are not believed to be especially reliable or accurate.
  • Other systems use a resistance measuring bridge circuit with a temperature-sensitive resistor, or thermistor, to precisely measure the temperature of the thermistor, which is assumed to be the temperature of the sensor. This temperature can then be used to directly compensate the infrared sensor output signal.
  • Many cold junction temperature compensation circuits are quite complicated and can add greatly to the cost of producing infrared thermometers. Other compensating systems do not provide a great deal of measurement accuracy, or are not especially reliable.
  • Infrared thermometers are otherwise advantageous, especially in a clinical setting where the faster speed and less intrusive nature of infrared thermometers are desirable. Simpler cold junction compensation systems could reduce the cost of providing infrared thermometers, making their superior qualities more widely available, and could provide greater accuracy and improved reliability.
  • thermometer circuitry that might be accurate at a particular cold junction temperature might give erroneous readings at another temperature.
  • an infrared thermometer that provides an accurate measurement of body temperatures lying in a range of 88°F to 108°F when the sensor temperature is at 68°F might not be accurate over that same range when the sensor temperature is 78°F.
  • the present invention is embodied in an infrared sensor-based thermometer that determines the temperature of a target and calibrates its temperature determination by determining the temperature of the sensor's cold junction based on the sensor's internal resistance, and by compensating for changes in the sensor's signal gain that occur with changes in its temperature.
  • the calibration greatly increases the reliability and accuracy of the target temperature determination and also reduces the cost of the thermometer from what it would be using conventional systems to provide similar benefits.
  • the sensor calibration function is achieved using many of the same circuit components also used for the temperature determination function, thereby not adding unduly to the complexity of the thermometer.
  • thermometer in accordance with the present invention includes a thermometer housing having a probe, within which is located the infrared sensor.
  • the sensor is selectively positioned so that its hot junction receives infrared energy from a target whose temperature is to be measured, so that the sensor generates a target sensor signal, which indicates any difference between the target temperature and the cold junction temperature of the sensor.
  • the thermometer also accurately determines the temperature of the sensor's cold junction by measuring the sensor's internal resistance, this cold junction temperature determination is used to determine the sensor's gain, so that the proper compensation coefficients can be applied to the calculation of target temperature.
  • the thermometer then calculates the temperature of the target using the target sensor signal and the sensor gain value.
  • an enhanced calibration is provided using a calibration reference whose temperature is known by means of a thermistor.
  • the probe containing the infrared sensor is selectively positioned so that the hot junction of the sensor receives infrared radiation from the calibration reference.
  • the sensor produces a reference sensor signal that establishes a baseline signal value.
  • the calibration reference is moved out of the sensor's field of view and the sensor is then positioned such that its hot junction receives infrared radiation from the target, whereupon it produces a target sensor signal.
  • the temperature of the target is then calculated.
  • the sensor gain coefficient is calculated using a linear gain formula that is a function of the sensor's cold junction temperature.
  • the coefficients of the quadratic target temperature formula are empirically determined for each infrared sensor.
  • the coefficients for the sensor gain function are likewise empirically determined for each infrared sensor.
  • the invention provides a quick and reliable means of determining the body temperatures of a large number of patients. Reading the calculated temperature does not require a great deal of skill or technique, but can be readily performed with a minimal amount of training.
  • the invention provides a simplified sensor temperature compensation circuit to correct for changes in sensor gain with changes in sensor temperature.
  • FIG. 1 is a side view of a thermometer apparatus in accordance with the present invention.
  • FIG. 2 is a simplified block diagram of the electrical components included in the thermometer of FIG. 1.
  • FIG. 3 is a graph showing the relationship between sensor resistance and sensor temperature for a typical infrared sensor of the type illustrated in FIG. 2.
  • FIG. 4 is a schematic diagram of a sensor circuit included in the infrared sensor thermometer illustrated in FIG. 1.
  • FIG. 5 is a schematic diagram representing the effective sensor circuit when the FIG. 4 circuit is in an amplifying mode.
  • FIG. 6 is a schematic diagram representing the effective sensor circuit when the FIG. 4 circuit is in a resistance measurement mode.
  • an infrared thermometer 10 that includes a generally pistol-shaped housing 12 with a handle portion 14 and an elongated probe 16 adapted for insertion into a patient's outer ear canal.
  • a display 18 is mounted at the rear of the housing, for displaying calculated temperatures, system messages, and functional indications.
  • An infrared sensor 30 located within the probe receives infrared radiation from the patient's eardrum and generates a corresponding electrical signal that is processed to determine the patient's body temperature.
  • the patient's body temperature is determined by comparing the infrared sensor signal generated while the sensor receives infrared radiation from the patient's eardrum with the signal generated while the sensor receives infrared radiation from a calibration reference having a known temperature.
  • the thermometer 10 also accurately determines the temperature of the sensor and compensates for signal changes that occur with changes in the temperature of the sensor.
  • thermometer 10 Before being used to determine a patient's body temperature, the thermometer 10 first must be calibrated. An indexing handle 20 on the housing 12 slides rearwardly to place the thermometer in a calibration mode, and it slides forwardly to place the thermometer in a ready mode. In the calibration mode, the elongated probe 16 is retracted into the housing and the infrared sensor 30 (FIG. 2) is positioned to receive infrared radiation from a movable calibration reference 36 (FIG. 2 ) . When the indexing handle 20 is moved forwardly to place the thermometer 10 in the ready mode, the calibration reference is moved away from the sensor and the elongated probe is moved out of the housing. The probe then may be inserted into the outer ear canal of a patient whose temperature is to be measured. A suitable mechanical structure for moving the probe relative to the calibration reference and housing is disclosed in U.S. Patent No. 4,993,424, which is incorporated herein by this reference.
  • a trigger 22 may be depressed to activate the temperature measurement circuitry of the thermometer, which includes a compensation system that accurately measures the internal resistance of the sensor, and therefore its temperature, and that also accounts for changes in the gain of the sensor due to its temperature.
  • the measured patient's body temperature is then shown on the display 18.
  • FIG. 2 is a simplified schematic representation of an internal portion of the thermometer 10 illustrated in FIG. 1. It shows the thermometer's infrared sensor 30, which has a cold junction 32 and a hot junction 34, positioned adjacent to the movable calibration reference 36.
  • the thermometer When the thermometer is placed in the calibration mode, i.e., with the indexing handle 20 retracted rearwardly, the calibration reference 36 is moved directly in front of the retracted probe 16 so that the hot junction 34 of the sensor receives infrared radiation substantially only from the calibration reference. As a result, the sensor produces an electrical output signal that indicates the difference in temperature between the cold junction and the calibration reference.
  • the temperature of the movable calibration reference 36 can be accurately determined using a thermistor 38, using techniques known to those skilled in the art.
  • thermometer 10 When the thermometer 10 is in the calibration mode, tests are performed by the thermometer's circuitry to ensure that the infrared sensor 30 and other electronic components of the thermometer are in a stable condition and to ensure that the ambient temperature and thermometer component temperatures are relatively stable. If temperature changes or other thermometer conditions are detected to be changing beyond predetermined limits, the thermometer will condition itself not to allow measurements to be taken. Sensor stability can be checked by examining the output signal of the sensor when the sensor is exposed to the calibration reference 36. When the sensor 30 is first positioned adjacent to the calibration reference, the hot junction 34 of the sensor receives infrared radiation from the reference and the sensor produces a sensor reference signal P b that is indicative of the difference in temperature between the reference and the sensor cold junction 32.
  • This sensor reference signal establishes a baseline for the remaining calculations. If the sensor reference signal P b is determined to vary above a predetermined rate, then the calibration process is re-initiated and a temperature measurement cannot be taken until calibration is complete and a new sensor reference signal P b is established. Between measurements, the probe 16 remains retracted within the housing 12 and the calibration sequence is performed at regular intervals, e.g., every 15 seconds, to continuously update the sensor reference signal P b .
  • thermometer 10 saves the last baseline sensor reference signal value P b before the indexing handle 20 was moved forward, because an operator might want to take a temperature measurement between calibration intervals without waiting for another calibration interval to be completed. Because during the calibration condition the thermometer calibrates every 15 seconds, the P b value can be no older than 15 seconds, and any variance in the sensor temperature within the 15-second interval will ordinarily be so small that using the previous P b value will not add unacceptable error into the calculation.
  • thermometer 10 in accordance with the present invention overcomes these deficiencies by providing an accurate indication of the sensor's cold junction temperature based on a calculation of the sensor's internal resistance. This is a more accurate and precise way of determining the base temperature as compared with conventional alternatives.
  • the infrared sensor 30 is preliminarily tested to precisely determine the relationship between its cold junction temperature and its internal resistance.
  • a chart of a typical relationship is shown in FIG. 3.
  • the internal resistance of the sensor 30 is advantageously determined at any temperature by establishing a bridge circuit that includes the sensor resistance and by passing a current through the sensor as part of the bridge circuit.
  • a sensor offset signal P s is produced by the sensor when a pulsed current is passed through the sensor circuit as the sensor is exposed to the calibration reference 36.
  • T s Cl (P s -P b ) 2 + C2 (P s -P b ) + C3
  • P s is the sensor offset signal
  • P b is the baseline sensor reference signal
  • Cl, C2, and C3 are constant coefficients that are empirically determined, as described further below.
  • a sensor gain factor must be determined before the temperature of a target can be calculated. It is important to determine the sensor gain because a sensor target signal P t produced by the sensor when it is exposed to a target of unknown temperature can vary over a given range of sensor operating temperatures even for a target of fixed temperature. That is, although the sensor target signal provides an indication of the temperature difference between the cold junction and the target, the relationship between the sensor target signal and the indicated temperature difference, i.e., the gain of the sensor, can change with the temperature of the sensor.
  • T s is the sensor temperature and Kl and K2 are constant coefficients that are empirically determined, as described further below.
  • the temperature of the target that is, the patient's body temperature
  • the temperature calculation is made by moving the elongated probe 16 out of the housing 12, placing the thermometer in the ready mode, and by inserting the probe into the patient's outer ear canal and depressing the trigger 22.
  • the temperature calculation is made by using the following temperature calculation formula:
  • thermometer 10 where P t is the sensor target signal from the infrared sensor 30, P b is the baseline sensor reference signal, G is the sensor gain, and T_ is the reference target temperature provided by the thermistor 38.
  • the calculated target temperature T is displayed on the display 18 while the trigger 22 is depressed, while afterwards the display shows the maximum calculated temperature during the time interval beginning when the elongated probe 16 was moved out of the housing 12 and ending when the trigger was released. The maximum calculated temperature is displayed until the probe is retracted.
  • the temperature T calculated by the thermometer 10 has been found to be very accurate and reliable, allowing many temperatures to be quickly taken under generally sanitary conditions. The thermometer provides these benefits at reduced cost and with greater efficiency.
  • thermometer circuitry advantageously uses many of the same electrical components both in determining the resistance of the sensor and in determining the temperature of the target, thereby providing cost savings.
  • the operation of the thermometer circuitry, including the infrared sensor 30, is best understood with reference to the schematic diagram of FIG. 4, which shows a sensor circuit 42 with an amplifier 44 connected to the infrared sensor 30.
  • the amplifier increases the magnitude of the sensor signal for easier manipulation, and also is used for determining the resistance and gain of the sensor. Because the amplifier would be necessary even without the sensor resistance and gain functions performed in accordance with the present invention, these additional functions are provided with a minimum of additional components.
  • a measurement object 45 such as the calibration reference 36
  • infrared radiation from the object is received by the hot junction 34 of the sensor, producing a sensor output signal.
  • the output signal from the infrared sensor 30 is provided over a signal line 46 to the positive input terminal of the amplifier 44, while four resistors 50, 52, 54, and 56 are selectively taken into and out of the circuit 42, as described more fully below, depending on the desired circuit function.
  • a switch 58 operates under control of a microprocessor (not shown in FIG. 4) to control the operation of the circuit and to determine the sensor resistance in the following manner.
  • the resistors 54 and 56 essentially play no part in the circuit 42, and the circuit assumes an amplifying mode of operation.
  • the circuit therefore effectively becomes that shown in FIG. 5, which is essentially a thermopile voltage amplifier circuit whose gain is set by the first two resistors 50 and 52.
  • FIG. 5 is essentially a thermopile voltage amplifier circuit whose gain is set by the first two resistors 50 and 52.
  • the amplifier output E 0 is approximately 0 volts. If the measurement object is the calibration reference 36, the output signal E 0 constitutes the sensor reference signal P b .
  • the circuit 42 assumes a resistance measurement mode of operation and effectively becomes a resistance bridge circuit as shown in FIG. 6, with a V REF applied voltage. Closing the switch activates the bridge circuit consisting of the fourth resistor 56 and the infrared sensor 30 resistance on one side, and the third resistor 54 and the first resistor 50 on the other side. Under this condition, the amplifier output signal E 0 is equal to the baseline signal as seen with the switch open, plus the imbalance of the resistance bridge. As known to those skilled in the art, the amplifier output signal can be used to deduce the internal resistance of the infrared sensor. It is to be understood that other methods could also be used to determine the internal resistance, but the circuit shown makes efficient use of circuit components already present.
  • the resistance of the infrared sensor 30 is determined from the change in the baseline signal of the amplified output while the sensor is viewing the calibration reference.
  • the amplifier output signal E 0 is measured with the resistance bridge circuit being inactive and then it is measured again with the resistance bridge circuit being active.
  • the difference in the amplifier output signal indicates the sensor resistance and, from the FIG. 3 chart, the sensor temperature.
  • the calibration reference need not be at the same temperature as the sensor, but the amplifier output signal difference is most easily determined if the reference object temperature and the sensor temperature are at least stable.
  • a microprocessor 60 controls the processing of signals in the thermometer 10 and controls operation of the switch 58 in the thermometer circuit 42.
  • the microprocessor receives the calibration reference temperature from the thermistor 38 via a line 62 and receives the sensor output signal E via a sensor output line 64.
  • a coefficient memory 66 provides the processor with the predetermined coefficients for the various functions used by the thermometer.
  • the microprocessor provides output information and operator messages to the display 18 over a line 68.
  • the coefficients associated with the sensor temperature function and sensor gain function will vary from unit to unit, so an automated production line process is used to determine the coefficients for each infrared sensor 30.
  • the temperatures of the sensor and a calibration reference 36 are both initially brought to approximately 65°F and allowed approximately 30 seconds to stabilize.
  • the output signal from the infrared sensor is then measured while the sensor and calibration reference both are held at this temperature.
  • the temperature of the calibration reference is then independently raised to approximately 80°F and the output signal of the infrared sensor is again measured, and finally the temperature of the calibration reference is raised to approximately 108°F and the output signal of the infrared sensor is again measured.
  • the temperatures of the infrared sensor 30 and the calibration reference 36 are both raised to approximately 80°F and stabilized, with the sensor output signal measured.
  • the calibration reference's temperature is then raised to 108°F and the sensor output signal is again measured.
  • the last step is for the temperature of the sensor and the calibration reference to be stabilized at approximately 100 ⁇ F, with the sensor output signal measured.
  • the calibration reference's temperature is then stabilized at 108°F, and the sensor output signal is again measured.
  • thermometer body 12 a flashing light 70 is provided on the thermometer body 12, to indicate when the baseline signal P b is varying to an extent that the thermometer 10 cannot calibrate. This indicates to the operator that the thermometer has conditioned itself not to allow a temperature measurement to be taken. Some heat transfer from the patient's body can occur during measurement, so the calibration waiting time allows the sensor temperature to cool down and stabilize.
  • the display 18 is updated approximately three times per second to show the present target temperature reading. Releasing the trigger displays the maximum calculated temperature that was calculated while the trigger was being depressed. This allows the operator to scan the eardrum, and more reliably obtain a temperature reading corresponding to the eardrum. This is necessary because the infrared sensor 30 receives infrared radiation not only from the eardrum, but also from the ear canal. The temperature of the eardrum is the more accurate indication of body temperature, and inevitably the temperature of almost all of the other objects within the ear will be lower than the eardrum temperature. Therefore, saving the maximum temperature reading while the infrared sensor was scanned through the ear will save and display a temperature most likely to be that of the eardrum, giving a reliable indication of the likely body temperature.
  • the calibration reference 36 is eliminated or at least used only infrequently.
  • the target temperature i.e., the patient's body temperature
  • the sensor's gain and the sensor's cold junction temperature both of which are determined based solely on the measurement of the sensor's internal resistance.
  • thermometers have been described above in terms of a presently preferred embodiment so that an understanding of the present invention can be conveyed.
  • the present invention should therefore not be seen as limited to the particular embodiment described herein, but rather, it should be understood that the present invention has wide applicability with respect to thermometers of a wide variety of configurations. Such alternate configurations can be achieved by those skilled in the art in view of the descriptions herein.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Radiation Pyrometers (AREA)

Abstract

Un thermomètre infrarouge (10) détermine la température d'un objet placé devant son capteur infrarouge (30). Le signal du capteur orienté vers un objet de référence d'une température connue est comparé au signal du capteur orienté vers un objet cible d'une température inconnue, ce qui permet de calculer la température de la cible. Le calcul de la température de la cible est corrigé en fonction des variations du signal du capteur qui sont dues aux variations de température du capteur lui-même. On applique cette correction en déterminant la température du capteur et un facteur de correction de gain du capteur, que l'on intègre dans le calcul de la température de la cible.
PCT/US1992/006939 1991-08-20 1992-08-18 Thermometre infrarouge et son procede d'etalonnage WO1993003666A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74767991A 1991-08-20 1991-08-20
US747,679 1991-08-20

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WO1993003666A1 true WO1993003666A1 (fr) 1993-03-04

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Cited By (12)

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WO1997037201A1 (fr) * 1996-04-02 1997-10-09 Braun Aktiengesellschaft Procede pour etalonner un thermometre a rayonnement
EP0801926A1 (fr) * 1995-11-13 1997-10-22 Citizen Watch Co. Ltd. Thermometre medical a rayonnement
EP1061348A2 (fr) * 1999-06-18 2000-12-20 Omron Corporation Thermomètre de rayonnement
EP1133680A2 (fr) * 1998-09-15 2001-09-19 Jonathan Gerlitz Thermometre infrarouge que l'on introduit dans l'oreille
US7346386B2 (en) 1998-09-11 2008-03-18 Exergen Corporation Temporal artery temperature detector
EP2437039A2 (fr) 2010-09-30 2012-04-04 Medisim Ltd. Thermomètre portable ergonomique
CN103674286A (zh) * 2013-11-20 2014-03-26 国网上海市电力公司 一种基于红外图像的站内通信设备故障诊断方法
JP2015117976A (ja) * 2013-12-17 2015-06-25 株式会社リコー 半導体集積回路
CN106667448A (zh) * 2016-11-24 2017-05-17 珠海泰莱笙科技有限公司 一种体温测量方法
CN106768036A (zh) * 2016-12-10 2017-05-31 哈尔滨工业大学 带有红外接收的可校准农业温湿度传感器
JP2018179567A (ja) * 2017-04-05 2018-11-15 旭化成エレクトロニクス株式会社 センサ出力処理装置およびセンサ出力処理方法
CN114216574A (zh) * 2021-12-16 2022-03-22 棒糖科技(杭州)股份有限公司 一种红外温度计辅助校准组件以及室温校准方法

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US2871701A (en) * 1955-09-14 1959-02-03 Lewis Eng Co Thermocouple cold junction compensator
US4993424A (en) * 1989-12-04 1991-02-19 Diatek, Incorporated Infrared medical thermometer
US5012813A (en) * 1988-12-06 1991-05-07 Exergen Corporation Radiation detector having improved accuracy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871701A (en) * 1955-09-14 1959-02-03 Lewis Eng Co Thermocouple cold junction compensator
US5012813A (en) * 1988-12-06 1991-05-07 Exergen Corporation Radiation detector having improved accuracy
US4993424A (en) * 1989-12-04 1991-02-19 Diatek, Incorporated Infrared medical thermometer

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0801926A1 (fr) * 1995-11-13 1997-10-22 Citizen Watch Co. Ltd. Thermometre medical a rayonnement
EP0801926A4 (fr) * 1995-11-13 1999-05-26 Citizen Watch Co Ltd Thermometre medical a rayonnement
WO1997037201A1 (fr) * 1996-04-02 1997-10-09 Braun Aktiengesellschaft Procede pour etalonner un thermometre a rayonnement
US6065866A (en) * 1996-04-02 2000-05-23 Braun Aktiengesellschaft Method of calibrating a radiation thermometer
US6283629B1 (en) 1996-04-02 2001-09-04 Braun Gmbh Method of calibrating a radiation thermometer
US9194749B2 (en) 1998-09-11 2015-11-24 Exergen Corporation Temporal artery temperature detector
US7346386B2 (en) 1998-09-11 2008-03-18 Exergen Corporation Temporal artery temperature detector
EP1133680A2 (fr) * 1998-09-15 2001-09-19 Jonathan Gerlitz Thermometre infrarouge que l'on introduit dans l'oreille
EP1133680A4 (fr) * 1998-09-15 2001-10-17 Jonathan Gerlitz Thermometre infrarouge que l'on introduit dans l'oreille
US6435711B1 (en) 1998-09-15 2002-08-20 Jonathan Gerlitz Infrared ear thermometer
EP1489396A1 (fr) * 1999-06-18 2004-12-22 Omron Healthcare Co., Ltd. Thermomètre de rayonnement
EP1489397A1 (fr) * 1999-06-18 2004-12-22 Omron Healthcare Co., Ltd. Thermomètre de rayonnement
EP1061348A3 (fr) * 1999-06-18 2003-08-13 Omron Corporation Thermomètre de rayonnement
EP1061348A2 (fr) * 1999-06-18 2000-12-20 Omron Corporation Thermomètre de rayonnement
EP2437039A2 (fr) 2010-09-30 2012-04-04 Medisim Ltd. Thermomètre portable ergonomique
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JP2018179567A (ja) * 2017-04-05 2018-11-15 旭化成エレクトロニクス株式会社 センサ出力処理装置およびセンサ出力処理方法
CN114216574A (zh) * 2021-12-16 2022-03-22 棒糖科技(杭州)股份有限公司 一种红外温度计辅助校准组件以及室温校准方法
CN114216574B (zh) * 2021-12-16 2024-03-22 棒糖科技(杭州)股份有限公司 一种红外温度计辅助校准组件以及室温校准方法

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