WO1993000576A1 - Dispositif servant a detecter une image thermique - Google Patents

Dispositif servant a detecter une image thermique Download PDF

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Publication number
WO1993000576A1
WO1993000576A1 PCT/JP1992/000549 JP9200549W WO9300576A1 WO 1993000576 A1 WO1993000576 A1 WO 1993000576A1 JP 9200549 W JP9200549 W JP 9200549W WO 9300576 A1 WO9300576 A1 WO 9300576A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermal image
element group
pyroelectric
optical system
chopper
Prior art date
Application number
PCT/JP1992/000549
Other languages
English (en)
Japanese (ja)
Inventor
Takashi Deguchi
Tatsuo Nakayama
Toshiaki Yagi
Ryoichi Takayama
Yoshihiro Tomita
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to DE4292011A priority Critical patent/DE4292011C2/de
Priority to CA002090115A priority patent/CA2090115C/fr
Publication of WO1993000576A1 publication Critical patent/WO1993000576A1/fr
Priority to KR93700477A priority patent/KR970003680B1/ko

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation
    • 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
    • G01J5/08—Optical arrangements
    • G01J5/0803—Arrangements for time-dependent attenuation of radiation signals
    • G01J5/0805—Means for chopping radiation
    • 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
    • G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
    • H04N3/08—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving reflector
    • H04N3/09—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving reflector for electromagnetic radiation in the invisible region, e.g. infrared

Definitions

  • the present invention relates to radiation temperature detection and human body behavior detection based on thermal images, such as temperature distribution in living rooms in a home and human body behavior detection.
  • Quantum infrared sensors have high sensitivity and a high response speed. About 0 0), not suitable for consumer use.
  • Thermal infrared sensors have relatively low sensitivity and low response speed, but do not require cooling, so they have been put to practical use in the consumer market.
  • Fig. 1 shows the embodiment.
  • Fig. 1 (a) is a structural diagram of a pyroelectric infrared sensor unit used for human body detection.
  • 1 is a pyroelectric infrared sensor
  • 2 is a Fresnel lens using polyethylene resin.
  • the Fresnel lens 2 has a light distribution characteristic for the viewing angle.
  • the pyroelectric infrared sensor 1 has a differential change output characteristic, and outputs only when the incident temperature changes.
  • the radiation temperature of the human body appears in the pyroelectric infrared sensor 1 as a time change input that appears, disappears, appears, and disappears. Entered. Therefore, the output of the pyroelectric infrared sensor Is output in synchronization with.
  • the optical system when configuring a system that runs a group of pyroelectric heat detecting elements arranged linearly in one dimension, if the optical system is outside the group of pyroelectric heat detecting elements, the optical system will have a scanning range. There is a problem that the whole area must be focused on & it must be large, and even if it covers the entire scanning range, the optical axis shifts and the sensitivity of the entire visual field is not uniform. .
  • the present invention provides a system for detecting a thermal image with a relatively simple system configuration.
  • the present invention has a plurality of pyroelectric heat detecting element groups one-dimensionally arranged on a linear axis and a rotation axis parallel or inclined at a fixed angle to the linear axis.
  • a two-dimensional image is obtained by rotating the group of heat detection elements.
  • the present invention detects a thermal image with a relatively simple configuration by rotating a group of one-dimensionally arranged pyroelectric heat detection elements, and detects a temperature distribution in a detection area, a haze motion of a human body, and the like. .
  • the present invention also provides a plurality of pyroelectric heat detection element groups arranged one-dimensionally on a linear axis, and an optical element integrated with the pyroelectric heat detection element group.
  • a two-dimensional thermal image is obtained by rotating the pyroelectric heat detecting element group and the optical system, which are integrated with a system and a rotation axis parallel or inclined at a fixed angle to the linear axis, about the rotation axis. That is,
  • the present invention provides a two-dimensional thermal image detection system having a compact and simple configuration by miniaturizing an optical system by integrally rotating a pyroelectric heat detecting element group and an optical system which are linearly arranged one-dimensionally. Things.
  • FIGS. 1 (a) and 1 (b) show the configuration of a conventional pyroelectric infrared unit for detecting a human body.
  • FIGS. 2 (a) and 2 (b) show the configuration of one embodiment of the present invention.
  • (A) and (b) are explanations of the mechanism for obtaining a thermal image.
  • FIG. 4 is a configuration using a transmission type lens.
  • FIG. 5 is a configuration using a reflection type lens.
  • ⁇ FIG. 6 is another embodiment of the present invention.
  • the schematic structure of the structure integrating the pyroelectric heat detection element group and the lens in the example 3 ⁇ 4 Fig. 7 is a front view in the optical axis direction showing the positional relationship between the non-circular lens and the pyroelectric heat detection element group.
  • FIG. 9 shows a schematic configuration of a two-dimensional thermal imaging device using a grid-type fixed chopper 3 ⁇ 4
  • Fig. 9 shows a schematic configuration of a two-dimensional thermal imaging device using a rotating chopper 3 ⁇ 4
  • Fig. 10 shows a pyroelectric heat detection element group
  • Fig. 11 shows a movable chopper connected to the pyroelectric heat detection element group and the optical system.
  • Schematic configuration of the two-dimensional thermal imaging device fixed to the axis of rotation 3 ⁇ 4 Fig. 12 schematically shows the relationship between the visual field of the group of pyroelectric heat detection elements and the movable range of the chopper in a system in which the movable range of the chopper is limited.
  • FIG. 2 is a configuration diagram of an embodiment of the present invention.
  • reference numerals 3a to 3e denote pyroelectric heat detection elements (hereinafter, referred to as elements), 4 denotes a pyroelectric heat detection element, and 5 denotes a rotation axis.
  • Fig. 2 (a) shows that the rotating shaft 5 is parallel to the pyroelectric heat detecting element group 4, and Fig. 2 (b) shows that the rotating shaft 5 and the pyroelectric detecting element group 4 are at a fixed angle '0' only. This shows the case where the vehicle is inclined. Angle 0 is selected depending on the internal structure of the device to be installed and the setting of the detection viewing angle.
  • FIG. Fig. 3 (a) shows the stereoscopic viewing angle of the detected thermal image
  • Fig. 3 (b) shows the detected thermal image.
  • the pyroelectric heat detection element group 4 has five elements, and is responsible for dividing the viewing angle into five in the vertical direction.
  • the pyroelectric-type mature detection element group 4 has a narrow viewing angle in the horizontal direction, and sequentially shifts the viewing angle in the ice flat direction with the rotation of the rotating shaft 5.
  • the pyroelectric type detection element group 4 measures the temperature each time it is sequentially moved, so that a two-dimensional thermal image shown in FIG. 3 (b) is obtained.
  • the motion of the human body is usually said to be l to 2 Hz. Is valid.
  • the commonly used pyroelectric infrared sensor is a so-called bulk type using a pyroelectric thick film sintered body.
  • the problem is that the response cannot keep up because the constant cannot be reduced. Therefore, by using a pyroelectric heat detecting element using a pyroelectric thin film of PbTiOS, etc., the response time can be reduced to about 1Z10 of the bulk type.
  • the pyroelectric heat detecting element using the pyroelectric thin film can shorten the response time, the behavior of the human body can be detected with high accuracy.
  • the use of a pyroelectric thin film can further reduce the size of the element.
  • the detection space when detecting temperature distribution and human body behavior in a living space, etc., the detection space generally has a wider viewing angle in the horizontal direction than in the vertical direction.
  • the responsible viewing angle of the detection element group 4 can be reduced, and this can contribute to reducing the number of elements or improving accuracy.
  • FIG. 4 An embodiment of a thermal image detecting apparatus using an optical system will be described with reference to FIGS. 4 and 5.
  • Fig. 4 shows the case where a transmission lens is used
  • Fig. 5 shows the case where a reflection lens is used.
  • the pyroelectric heat detection element group 4 is a single optical system, and the divided viewing angles are assigned to the elements 3a to 3e. By using one optical system, the system can be downsized and the accuracy of the viewing angle of each element can be easily obtained.
  • the optical system can be designed to be small. Furthermore, if a pyroelectric thin film is used for the element as described above, a very small system can be realized.
  • the transmission type lens 6 the material that transmits infrared light is very limited, whereas the reflection type lens 7 shown in Fig. 5 is used. Then, the infrared light reflecting material can be easily obtained by aluminum coating or the like, so that the optical system can be easily and inexpensively constructed.
  • FIG. 6 a two-dimensional thermal image detection apparatus in which the optical system is integrated with a pyroelectric detection element group will be described with reference to FIGS. 6 to 11.
  • FIG. 6 a two-dimensional thermal image detection apparatus in which the optical system is integrated with a pyroelectric detection element group
  • reference numeral 15 denotes a pyroelectric heat detecting element group
  • 15a to 15e denote pyroelectric heat detecting elements
  • Reference numeral 17 denotes a structure for integrating the pyroelectric heat detecting element group 15 with the lens 16, and the pyroelectric heat detecting element group 15 is arranged on the optical axis 30 of the lens 16.
  • FIG. 7 shows the positional relationship between the lens and the pyroelectric heat detection element group as viewed from the front in the optical axis direction when a circular lens is used as an example of a non-circular lens.
  • Reference numeral 15 denotes a group of pyrothermal type heat detecting elements, and a non-circular lens 16a having a size necessary to cover the field of view of the group of pyroelectric type thermal detecting elements 15 is arranged in front and illustrated.
  • the pyroelectric heat detection element group 15 and the lens 16 that are not fixed are fixed to a structure that integrates the pyroelectric heat detection element group 15 and the lens 16 to form a system similar to that shown in FIG.
  • the broken line shows the size of the lens when a circular lens is used.
  • reference numeral 20a denotes a chopper fixed outside the pyroelectric heat detection element group 15 and the lens 16 and has a lattice shape.
  • 30 is the optical axis of the lens.
  • 20 b is a rotary chopper installed outside the pyroelectric heat detecting element group 15 and the lens 16, and the rotating shaft 31 of the chopper is a pyroelectric heat detecting element group. It is fixed to the outside of 15 and lens 16.
  • reference numeral 20a denotes a pyroelectric heat detection element group 15 and This is a fixed chopper installed between hands 16.
  • the rotation axis 31 of the rotary chopper 20 b is fixed to the rotation axis 18 of the pyroelectric heat detection element group 15 and the lens 16.
  • reference numeral 25 denotes a movable chopper for opening and closing the window 25
  • reference numeral 25 denotes a movable chopper that opens and closes the window 25.
  • the heat detection element group 15 and the lens 16 are fixed to a structure in which they are integrated.
  • the structure 17 in which the pyroelectric heat detection element group 15 and the lens 16 are integrated is rotated about the rotation axis 18 so that the field of view of the chopper 20 a is fixed. Is scanned to obtain the differential output signal.
  • the chopper 20b rotates at a sufficient rotation speed independent of the rotation speed around the rotation shaft 18.
  • the fixed-type chopper 20a is sandwiched between the pyroelectric heat-detecting element group 15 and the lens 16, and the pyroelectric heat-detecting element group 15 and the lens around the rotation axis 18 are sandwiched. 1 6 rotates together 3 ⁇ 4o
  • the rotary chopper 20b rotates around the rotation axis 18 together with the pyroelectric heat detection element group 15 and the lens 16 to perform ⁇ chic pinking.
  • the chopper 20 d reciprocates to open and close the window 25.
  • the positional relationship between the lens 16 and the pyroelectric heat detecting element group 15 does not change during scanning. There is no shift and the entire field of view can be detected with uniform sensitivity.
  • the lens 16 can be made smaller than a non-integrated system, and the entire system can be downsized.
  • the lens 16a can be made small, and thus the system can be downsized.
  • the chopper 20a is fixed to the outside of the pyroelectric heat detection element group 15 and the lens 16 so that only the rotation mechanism around the rotation axis 18 is used.
  • a two-dimensional thermal image can be obtained with a simple system.
  • a rotary chopper 20b is placed outside the pyroelectric heat detecting element group 15 and the lens 16 and this chopper-20b is rotated at a sufficient speed.
  • a two-dimensional thermal image without blind spots can be obtained.
  • the field of view of the pyroelectric heat detection element group 15 is narrowed down at the position of the chopper 20a, so that the chopper 20a can be downsized.
  • the movable chopper 20 b is The chopper 20b can be reduced in size by employing a method of rotating together with the heat detection element group and the optical system, and the entire system can also be reduced in size.
  • the movable chopper 20d By limiting the movable range of the movable chopper 20d to the field of view assigned to the pyroelectric heat detection element group 15 as shown in Fig. 12, the movable chopper 20d can be downsized. it can.
  • a force using a rotary chopper 2 Ob as a movable chopper is a movable chopper 20a having a lattice shape shown in FIG. 8, or an openable chopper shown in FIG. The same effect can be obtained even with 10 d.
  • FIG. 10 a similar effect can be obtained by using a movable chopper instead of the fixed chopper 20a.
  • a chopper that translates a grid-shaped chopper in place of the rotary chopper 20b in Fig. 11 or an openable chopper as shown in Fig. 11 is used as a pyroelectric heat detecting element. The same effect can be obtained when fixed to the rotation axis of the group and the optical system.
  • a thermal image can be detected with a relatively simple system configuration by rotating a group of pyroelectric heat detection elements arranged one-dimensionally.
  • the position S behavior of the human body can be accurately detected by setting the thermal image detection time due to rotation to within approximately 1 second 1.
  • the response speed of a thermal image can be improved, and the system can be downsized.
  • the rotation direction to the horizontal direction, it is possible to contribute to miniaturization of the system or improvement of the accuracy in a normal case.
  • the size of the system can be reduced.
  • the accuracy of the viewing angle of each element can be improved.
  • the size of the optical system can be further reduced.
  • an optical system can be easily and inexpensively constituted by a reflection type lens.
  • the positional relationship between the pyroelectric heat detection element group and the optical system is scanned. There is no change in the optical axis, and the entire field of view can be detected with uniform sensitivity.
  • the optical system can be downsized, and the entire system can be downsized.
  • the system can be reduced in size at any time.
  • the configuration of the chopper can be simplified by using a fixed chopper.
  • the use of a movable chopper can eliminate blind spots in the obtained two-dimensional thermal image.
  • a chopper is placed between the pyroelectric heat detection element group and the optical system.
  • the chopper only needs to cover the field of view narrowed by the lens, and the chopper can be downsized.
  • the chopper can be downsized and the system can be downsized.
  • the chopper can be downsized, and the entire system can be downsized.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Electromagnetism (AREA)
  • Radiation Pyrometers (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

Dispositif servant à détecter une image thermique, comportant un groupe d'éléments thermocapteurs de type pyroélectrique (5) agencés sur une rangée, un système optique (6), une structure (7) permettant de réunir en un seul corps le groupe d'éléments thermocapteurs de type pyroélectrique (5) et le système optique (6), et un arbre rotatif (8) faisant tourner la structure (7). Grâce à cette configuration, le système de détection d'images thermiques bidimensionnelles par l'utilisation du groupe d'éléments thermocapteurs de type pyroélectrique (5) agencés sur une rangée de manière unidimensionnelle présente une structure simple et peu encombrante.
PCT/JP1992/000549 1991-06-24 1992-04-27 Dispositif servant a detecter une image thermique WO1993000576A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4292011A DE4292011C2 (de) 1991-06-24 1992-04-27 Thermische Bilderfassungsvorrichtung
CA002090115A CA2090115C (fr) 1991-06-24 1992-04-27 Appareil de detection a images thermiques
KR93700477A KR970003680B1 (en) 1991-06-24 1993-02-19 Thermal image detection apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3/151415 1991-06-24
JP3151415A JPH04372828A (ja) 1991-06-24 1991-06-24 熱画像検出装置

Publications (1)

Publication Number Publication Date
WO1993000576A1 true WO1993000576A1 (fr) 1993-01-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1992/000549 WO1993000576A1 (fr) 1991-06-24 1992-04-27 Dispositif servant a detecter une image thermique

Country Status (5)

Country Link
JP (1) JPH04372828A (fr)
KR (1) KR970003680B1 (fr)
CA (1) CA2090115C (fr)
DE (2) DE4292011C2 (fr)
WO (1) WO1993000576A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5858531A (en) * 1996-10-24 1999-01-12 Bio Syntech Method for preparation of polymer microparticles free of organic solvent traces
US11314971B2 (en) 2017-09-27 2022-04-26 3M Innovative Properties Company Personal protective equipment management system using optical patterns for equipment and safety monitoring

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104662397B (zh) * 2013-07-31 2017-06-27 松下电器（美国）知识产权公司 传感器组件

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JPS55158524A (en) * 1979-05-28 1980-12-10 Kureha Chem Ind Co Ltd Pyroelectric image sensor
JPS61173124A (ja) * 1985-01-28 1986-08-04 Matsushita Electric Ind Co Ltd 焦電型熱画像装置
JPS61186826A (ja) * 1985-02-14 1986-08-20 Matsushita Electric Ind Co Ltd 熱画像装置
JPS61290330A (ja) * 1985-06-18 1986-12-20 Matsushita Electric Ind Co Ltd 焦電型熱画像装置
JPS6216074B2 (fr) * 1981-01-27 1987-04-10 Mitsubishi Electric Corp
JPH0443925A (ja) * 1990-06-11 1992-02-13 Matsushita Electric Ind Co Ltd 焦電型赤外線検知装置

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US4121454A (en) * 1976-12-03 1978-10-24 Monitek, Inc. Clamp on electromagnetic flow transducer
JPS5620479A (en) * 1979-07-30 1981-02-26 Sofuia Kk Pinball machine
JPS57168045A (en) * 1981-04-08 1982-10-16 Toyota Motor Corp Air-fuel-ratio control device for internal combustion engine
JPH073362B2 (ja) * 1984-06-14 1995-01-18 株式会社村田製作所 一次元焦電型センサアレイ
DE3616374A1 (de) * 1986-05-15 1987-11-19 Siemens Ag Pyrodetektor, vorzugsweise geeignet fuer bewegungs- und richtungsselektives detektieren
ATE109274T1 (de) * 1986-06-20 1994-08-15 Lehmann Martin Verfahren zum berührungslosen messen einer temperatur von einem körper sowie anordnung hierfür.
GB8913450D0 (en) * 1989-06-12 1989-08-02 Philips Electronic Associated Electrical device manufacture,particularly infrared detector arrays

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55158524A (en) * 1979-05-28 1980-12-10 Kureha Chem Ind Co Ltd Pyroelectric image sensor
JPS6216074B2 (fr) * 1981-01-27 1987-04-10 Mitsubishi Electric Corp
JPS61173124A (ja) * 1985-01-28 1986-08-04 Matsushita Electric Ind Co Ltd 焦電型熱画像装置
JPS61186826A (ja) * 1985-02-14 1986-08-20 Matsushita Electric Ind Co Ltd 熱画像装置
JPS61290330A (ja) * 1985-06-18 1986-12-20 Matsushita Electric Ind Co Ltd 焦電型熱画像装置
JPH0443925A (ja) * 1990-06-11 1992-02-13 Matsushita Electric Ind Co Ltd 焦電型赤外線検知装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5858531A (en) * 1996-10-24 1999-01-12 Bio Syntech Method for preparation of polymer microparticles free of organic solvent traces
US11314971B2 (en) 2017-09-27 2022-04-26 3M Innovative Properties Company Personal protective equipment management system using optical patterns for equipment and safety monitoring
US11682185B2 (en) 2017-09-27 2023-06-20 3M Innovative Properties Company Personal protective equipment management system using optical patterns for equipment and safety monitoring

Also Published As

Publication number Publication date
CA2090115A1 (fr) 1992-12-25
JPH04372828A (ja) 1992-12-25
DE4292011C2 (de) 1997-09-04
DE4292011T1 (fr) 1993-07-15
KR970003680B1 (en) 1997-03-21
CA2090115C (fr) 1999-06-22

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