WO2019201564A1 - Dispositif à ondes continues à modulation de fréquence pour l'examen de panneaux isolants et procédé correspondant - Google Patents

Dispositif à ondes continues à modulation de fréquence pour l'examen de panneaux isolants et procédé correspondant Download PDF

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Publication number
WO2019201564A1
WO2019201564A1 PCT/EP2019/057657 EP2019057657W WO2019201564A1 WO 2019201564 A1 WO2019201564 A1 WO 2019201564A1 EP 2019057657 W EP2019057657 W EP 2019057657W WO 2019201564 A1 WO2019201564 A1 WO 2019201564A1
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WO
WIPO (PCT)
Prior art keywords
frequency
insulation panel
radiation
insulation
layer
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Application number
PCT/EP2019/057657
Other languages
English (en)
Inventor
Metin Kaya
Goksin Sayer
Hakan Altan
Asaf Behzat SAHIN
Batuhan OZDEMIR
Original Assignee
Arcelik Anonim Sirketi
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.)
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Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2019201564A1 publication Critical patent/WO2019201564A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation

Definitions

  • the present invention particularly relates to a device enabling an insulation panel of composite structure to be examined in a non-destructive manner.
  • Such type of materials can be produced externally and introduced to the construction or the household appliance or may be applied as a composite material during building of the construction or production of the household appliance.
  • spray polyurethane foams are used for thermal insulation in construction applications.
  • the insulation material, particularly foam material is transferred in liquid state and solidifies quickly, covering the applied space.
  • PU polyurethane
  • EP2835629 discloses a device examining composite structured materials, particularly layered foam assemblies in a non-contact manner by forming two or three-dimensional images in microwave-mm wave-terahertz range.
  • US2015041654 discloses a device inspecting foam materials in a non-contact manner by forming two or three-dimensional images in microwave-mm wave-terahertz range and using vector network analyzer enabling obtaining phase and amplitude information.
  • US2010171518 discloses a device measuring thermal conductivity characteristics of a composite laminate type material in a non-destructive and non-contact manner by using electrical methods.
  • the aim of the present invention is to realize a device examining the physical parameters of an insulation panel of composite structure in a non-destructive manner.
  • the device realized to achieve the aim of the present invention and disclosed in the first claim and the dependent claims, is adapted to examine the physical parameters of an insulation panel of composite structure, and comprises a transceiver positioned at a given distance from an insulation panel, at least one antenna, an optical mechanism suitable for radiation generated in a predetermined frequency bandwidth, and a control unit evaluating the frequency of the radiation transmitted to the insulation panel and the radiation reflected from the insulation panel by means of the antenna.
  • the device enables determining the physical parameters of insulation panels having such type of composite structures, in a non-destructive manner.
  • the antenna is a pyramid horn type antenna.
  • the optical mechanism is a lens.
  • the device comprises an oscillator provided on the transceiver, in which frequency modulation is applied by using signal generator, an amplifier enabling amplifying the radiation generated by the oscillator, a multiplier structure multiplying the oscillator frequency to reach the desired terahertz band, and a directional coupler.
  • the transceiver further comprises a harmonic scrambler, and the intermediate frequency which leaves the harmonic scrambler by being scrambled, reaches the control unit.
  • the oscillator generates radiation with a frequency in the range of 10-11 GHz.
  • the multiplier structure preferably amplifies the frequency of the radiation at least 48 times.
  • the oscillator generates radiation with a frequency in the range of 13-15 GHz.
  • the multiplier structure preferably amplifies the frequency of the radiation at least 36 times.
  • the microwave frequency preferably in the range of 10-11 GHz, generated on the oscillator in which frequency modulation is applied, is preferably amplified by a multiplier of x48 after the amplifier, directed via the directional coupler to the antenna and then collimated in a diameter of 5 cm to the insulation panel to be examined through the lens.
  • the radiation of 500GHz +/-25 GHz frequency reaches the antenna via the same lens, is then scrambled by means of the harmonic scrambler provided in the directional coupler receiver portion, and reaches the IF (intermediate frequency) control unit.
  • the IF signals coming from the insulation panels of composite structure in varying thickness is examined by means of the control unit and the user is informed about the thermal conductivity coefficient, density and strength, preferably compression strength of the insulation material disposed in the insulation panel.
  • Non-destructive measurement of the thermal conductivity, density and strength of the polyurethane foam in the insulation panel positioned particularly in cooler walls can be performed by analyzing amplitude and phase information of the radiation in 500 GHz frequency range.
  • the terahertz frequency radiation generated to measure the insulation panels with polyurethane foam content whose thickness may vary, should be scanned in the vicinity of central frequency. Insulation panel characteristics can thus be examined by way of frequency modulated continuous wave (FMCW) measurement method.
  • FMCW frequency modulated continuous wave
  • the device of the invention operates as follows.
  • the terahertz transceiver positioned at a given distance from an insulation panel of composite structure, directs the terahertz radiation generated by means of the antenna in a given bandwidth and scanned in a given modulation frequency, on the insulation panel of composite structure by a suitable optical mechanism. After the beams being passed through the layers forming the insulation panel and reflected from the rear surface of the insulation panel, the signal received by means of the antennas enter the transceiver, mix in the transceiver with the radiation sent here, and then the frequency difference occurring in between is directed to the control unit.
  • the signal is then analyzed according to the applied modulation frequency, the signal loss and phase change information forming between the incoming and outgoing signals are processed, and then the influence of the thickness and the refractive index of the layers forming the insulation panel are filtered from the signal, enabling calculating the absorption coefficient, thickness and refractive index of the insulation material.
  • Thermal conductivity, density and strength information of the insulation material are calculated according to this information and are informed to the user.
  • Terahertz FMCW measurement system can thus be utilized in measuring the insulation panels of composite structure, used particularly in coolers.
  • the present invention enables precise two and three-dimensional imaging of an insulation panel particularly forming cooler walls.
  • the device of the invention operates in any frequency between 0.300 THz and 0.550 THz, i.e. within the terahertz range in which differences in thermal conductivity, strength and density of a polyurethane foam used as insulation material are the most apparent and in a manner not to be influenced from the humidity in the environment.
  • the present invention enables numerically determining thermal conductivity, density and strength differences between a polyurethane foam formed in a free environment and a polyurethane foam formed in a mold.
  • the present invention further enables associating thermal conductivity coefficient with refractory index of the polyurethane foam.
  • it is also enabled to associate the absorption coefficient with the thermal conductivity, strength and density values of the insulation material, i.e. polyurethane foam disposed in an insulation panel of composite structure.
  • a device is developed by means of the invention, which can operate in factory environment, which is capable of determining structural defects of an insulation panel, enabling obviating the defects within the scope of production stage.
  • Figure 1 is a schematic view of an insulation panel and the device.
  • the device (5) of the invention performing frequency modulated continuous terahertz measurement is adapted to examine the physical parameters of an insulation panel (1) of composite structure, and comprises an oscillator, a transceiver (6) positioned at a given distance from an insulation panel (1), at least one antenna (7), an optical mechanism (8) suitable for radiation generated in a predetermined frequency bandwidth, and a control unit (9) evaluating the frequency of the radiation transmitted to the insulation panel (1) and the radiation reflected from the insulation panel (1) by means of the antenna (7) ( Figure 1).
  • the device (5) of the invention operates in any frequency between 0.300 THz and 0.550 THz frequency values, i.e. in terahertz frequency range.
  • the insulation panel (1) comprises a first layer (2), a second layer (4) and an insulation material provided between the first layer (2) and the second layer (4).
  • the first layer (2) is plastic
  • the second layer (4) is metal, preferably metal sheet and the insulation material is polyurethane foam.
  • the insulation panel (1) forms the walls of a cooler.
  • the radiation generated by the oscillator is sent to the optical mechanism (8) via the transceiver (6) and is directed on the insulation panel (1) via the optical mechanism (8).
  • the radiation passes through the first layer (2), then through the insulation material and reaches the second layer (4), is reflected therefrom, collected by means of the antenna (7) and is transmitted to the control unit (9) via the transceiver (6).
  • the user is enabled to be informed about thermal conductivity coefficient, density and preferably compression strength of the insulation material provided in an insulation panel (1) by evaluating the difference between the radiation directed on the insulation panel (1) and the radiation reflected from the insulation panel (1).
  • the antenna (7) is a pyramid horn type antenna.
  • the optical mechanism (8) is a lens.
  • the device (5) comprises an oscillator provided on the transceiver (6), on which frequency modulation is applied by using signal generator, an amplifier enabling amplifying the radiation generated by the oscillator, a multiplier structure multiplying the oscillator frequency to reach the desired terahertz band and a directional coupler.
  • the transceiver (6) further comprises a harmonic scrambler, and the frequency information obtained by the frequency which leaves the harmonic scrambler by being scrambled, reaches the control unit (9).
  • the oscillator generates radiation with a frequency in the range of 10-11 GHz.
  • the multiplier structure preferably amplifies the frequency of the radiation at least 48 times.
  • the oscillator generates radiation with a frequency in the range of 13-15 GHz.
  • the multiplier structure preferably amplifies the frequency of the radiation at least 36 times.
  • the microwave frequency preferably in the range of 10-11 GHz generated on the oscillator in which frequency modulation is applied, is preferably amplified by a multiplier of x48 after the amplifier, directed via the directional coupler to the antenna (7) and then collimated in a diameter of 5 cm to the insulation panel (1) to be examined through the lens.
  • the radiation of 500GHz +/-25 GHz frequency reaches the antenna (7) via the same lens, is then scrambled by means of the harmonic scrambler provided in the directional coupler transceiver (6) and reaches the IF (intermediate frequency) control unit (9).
  • the IF signals coming from the insulation panels (1) of composite structure in varying thickness is examined by means of the control unit (9) and the user is informed about the thermal conductivity coefficient, density and strength of the insulation material disposed in the insulation panel (1).
  • Non-destructive measurement of the thermal conductivity of the polyurethane foam in the insulation panel (1) positioned particularly in cooler walls can be performed by analyzing amplitude and phase information of the radiation in 500 GHz frequency range.
  • the terahertz frequency radiation generated to measure the insulation panels (1) with polyurethane foam content whose thickness may vary, should be scanned in the vicinity of central frequency. Insulation panel (1) characteristics can thus be examined by way of frequency modulated continuous wave (FMCW) measurement method.
  • FMCW frequency modulated continuous wave
  • the device (5) of the invention operates as follows.
  • the terahertz transceiver (6) positioned at a given distance from an insulation panel (1) of composite structure, directs the terahertz radiation generated by means of the antenna (7) in a given bandwidth and scanned in a given modulation frequency, on the insulation panel (1) of composite structure by a suitable optical mechanism (8). After the beams passing through the layers forming the insulation panel (1), are reflected from the rear surface of the insulation panel (1), the signal received by means of the antennas (7) enter the transceiver (6), mix in the transceiver (6) with the radiation sent here, and then the frequency difference occurring in between is directed to the control unit (9).
  • the signal is analyzed here according to the applied modulation frequency, the signal loss and phase change information forming between the incoming and outgoing signals are processed, and then the influence of the thickness and the refractive index of the layers forming the insulation panel (1) are filtered from the signal, enabling calculating the absorption coefficient, thickness and refractive index of the insulation material.
  • Thermal conductivity, density and strength information of the insulation material are calculated according to this information and are informed to the user.
  • Terahertz FMCW measurement method can thus be utilized in measuring the insulation panels of composite structure particularly used in coolers.
  • a device (5) is developed by means of the invention, which can operate in factory environment, which is capable of determining structural defects of an insulation panel (1), enabling obviating the defects within the scope of production stage.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Le dispositif (5) de l'invention effectuant une mesure térahertz continue à modulation de fréquence est conçu pour examiner les paramètres physiques d'un panneau d'isolation (1) de structure composite et comprend un oscillateur permettant une modulation de fréquence térahertz, un émetteur-récepteur (6) positionné à une distance donnée d'un panneau d'isolation (1), au moins une antenne (7), un mécanisme optique (8) approprié pour un rayonnement généré dans une bande passante de fréquence prédéterminée, et une unité de commande (9) d'évaluation de la fréquence du rayonnement transmis au panneau d'isolation (1) et du rayonnement réfléchi par le panneau d'isolation (1) au moyen de l'antenne (7).
PCT/EP2019/057657 2018-04-17 2019-03-27 Dispositif à ondes continues à modulation de fréquence pour l'examen de panneaux isolants et procédé correspondant WO2019201564A1 (fr)

Applications Claiming Priority (2)

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TRA2018/05457 2018-04-17
TR201805457 2018-04-17

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WO2019201564A1 true WO2019201564A1 (fr) 2019-10-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020078866A1 (fr) * 2018-10-15 2020-04-23 Covestro Deutschland Ag Procédé et dispositif pour la détection d'imperfections dans l'isolation d'un appareil de réfrigération
CN113823888A (zh) * 2021-05-06 2021-12-21 北京理工大学 基于高温超导技术的双频匹配、二次谐波太赫兹混频器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6096416A (en) * 1997-06-26 2000-08-01 Altenberg; Milton J. Metal sandwich panels
US20100171518A1 (en) 2008-12-16 2010-07-08 University Of New Brunswick Method and apparatus for non-destructive detection of defects in composite laminate structures
EP2835629A1 (fr) 2013-08-08 2015-02-11 Stichting SRON Netherlands Institute for Space Research Procédé et système d'inspection d'assemblages composites utilisant un rayonnement térahertz
US20150041654A1 (en) 2013-08-08 2015-02-12 Stichting SRON - Netherlands Institute for Space Research Method and system for inspection of composite assemblies using terahertz radiation
CN106769994A (zh) 2017-01-19 2017-05-31 中国科学院上海技术物理研究所 一种太赫兹亚波长分辨成像装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6096416A (en) * 1997-06-26 2000-08-01 Altenberg; Milton J. Metal sandwich panels
US20100171518A1 (en) 2008-12-16 2010-07-08 University Of New Brunswick Method and apparatus for non-destructive detection of defects in composite laminate structures
EP2835629A1 (fr) 2013-08-08 2015-02-11 Stichting SRON Netherlands Institute for Space Research Procédé et système d'inspection d'assemblages composites utilisant un rayonnement térahertz
US20150041654A1 (en) 2013-08-08 2015-02-12 Stichting SRON - Netherlands Institute for Space Research Method and system for inspection of composite assemblies using terahertz radiation
CN106769994A (zh) 2017-01-19 2017-05-31 中国科学院上海技术物理研究所 一种太赫兹亚波长分辨成像装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
YU ZHOU ET AL: "High-precision terahertz frequency modulated continuous wave imaging method using continuous wavelet transform", OPTICAL ENGINEERING., vol. 57, no. 02, 26 February 2018 (2018-02-26), BELLINGHAM, pages 1 - 7, XP055593863, ISSN: 0091-3286, DOI: 10.1117/1.OE.57.2.023108 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020078866A1 (fr) * 2018-10-15 2020-04-23 Covestro Deutschland Ag Procédé et dispositif pour la détection d'imperfections dans l'isolation d'un appareil de réfrigération
CN113823888A (zh) * 2021-05-06 2021-12-21 北京理工大学 基于高温超导技术的双频匹配、二次谐波太赫兹混频器
CN113823888B (zh) * 2021-05-06 2022-05-17 北京理工大学 基于高温超导技术的双频匹配、二次谐波太赫兹混频器

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