WO2019201564A1 - Frequency modulated continuous wave device for examining insulating panels and corresponding method - Google Patents

Frequency modulated continuous wave device for examining insulating panels and corresponding method 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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WIPO (PCT)
Prior art keywords
frequency
insulation panel
radiation
insulation
layer
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PCT/EP2019/057657
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French (fr)
Inventor
Metin Kaya
Goksin Sayer
Hakan Altan
Asaf Behzat SAHIN
Batuhan OZDEMIR
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Arcelik Anonim Sirketi
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Publication of WO2019201564A1 publication Critical patent/WO2019201564A1/en

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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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Abstract

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 capable of terahertz frequency modulation, 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).

Description

[Title established by the ISA under Rule 37.2]FREQUENCY MODULATED CONTINUOUS WAVE DEVICE FOR EXAMINING INSULATING PANELS AND CORRESPONDING METHOD
The present invention particularly relates to a device enabling an insulation panel of composite structure to be examined in a non-destructive manner.
Utilizing materials with low thermal conductivity as construction materials or in household appliances used for heating or cooling purposes, is of utmost importance in terms of energy efficiency. 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. For example, spray polyurethane foams are used for thermal insulation in construction applications. During application, the insulation material, particularly foam material is transferred in liquid state and solidifies quickly, covering the applied space. Likewise, it is also rather common to use polyurethane (PU) foam components as insulation material in coolers, which are filled through certain points during production stage thereof. Particularly in such composite structures, structural defects likely to occur during and after filling of polyurethane foam and the amount of air entrapped in the structure during solidification, adversely affect the insulating characteristics of the composite structure. In addition, a non-uniform composition of the polyurethane foam structure adversely affects the material's strength and density. The physical parameters of such type of composite structures which are generally produced so as to be opaque, can only be examined by destructing the product. Such kind of examinations increase costs and lead to loss of time and labor particularly in products such as coolers which are mass produced in high amounts.
State of the art Chinese patent application no. CN106769994 discloses a device developed for imaging polytetrafluoroethylene samples in terahertz range near-field with high resolution.
Another prior art document is the European patent application no. EP2835629. This document 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.
Another prior art document, the United States patent application no. 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.
Another prior art document, the United States patent application no. 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.
In the preferred embodiment of the invention, the antenna is a pyramid horn type antenna.
In the preferred embodiment of the invention, the optical mechanism is a lens.
In an embodiment of the invention, 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.
In an embodiment of the invention, the oscillator generates radiation with a frequency in the range of 10-11 GHz. In this embodiment of the invention, the multiplier structure preferably amplifies the frequency of the radiation at least 48 times.
In another embodiment of the invention, the oscillator generates radiation with a frequency in the range of 13-15 GHz. Also in this embodiment of the invention 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. After being reflected by interacting with the insulation panel, 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. Thus, 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.
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. In addition, 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.
The device enables two and three-dimensional imaging of insulation panels of composite structure by means of a transceiver assembly having a compact 500 GHz (=0.5 THz) central frequency and using FMCW measurement method thanks to an assembly amplifying frequency based on solid state technology.
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.
A device realized to achieve the aims of the present invention is illustrated in the accompanying drawings, wherein:
Figure 1 is a schematic view of an insulation panel and the device.
The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.
  1. Insulation panel
  2. First layer
  3. Insulation material
  4. Second layer
  5. Device
  6. Transceiver
  7. Antenna
  8. Optical mechanism
  9. Control unit
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). In an embodiment of the invention, the first layer (2) is plastic, the second layer (4) is metal, preferably metal sheet and the insulation material is polyurethane foam. In the preferred embodiment of the invention, 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).
In the preferred embodiment of the invention, the antenna (7) is a pyramid horn type antenna.
In the preferred embodiment of the invention, the optical mechanism (8) is a lens.
In an embodiment of the invention, 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).
In an embodiment of the invention, the oscillator generates radiation with a frequency in the range of 10-11 GHz. In this embodiment of the invention, the multiplier structure preferably amplifies the frequency of the radiation at least 48 times.
In another embodiment of the invention, the oscillator generates radiation with a frequency in the range of 13-15 GHz. Also in this embodiment of the invention 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. After being reflected by interacting with the insulation panel (1), 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). Thus, 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.
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.

Claims (14)

  1. A device (5) performing frequency modulated continuous terahertz measurement, adapted to examine the physical parameters of an insulation panel (1) of composite structure, comprising 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).
  2. A device (5) according to claim 1, characterized by operating in any frequency between 0.300 THz and 0.550 THz frequency values.
  3. An insulation panel (1) according to claim 1, comprising a first layer (2), a second layer (4) and an insulation material provided between the first layer (2) and the second layer (4).
  4. An insulation panel (1) according to claims 1 and 3, comprising a first layer (2) which is plastic, a second layer (4) which is metal, and an insulation material which is polyurethane foam.
  5. A device (5) according to claim 1, characterized by a control unit (9) informing the user about the characteristics of the insulation material provided in the 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).
  6. A device (5) according to claim 1, characterized by the pyramid horn type antenna (7).
  7. A device (5) according to claim 1, characterized by the optical mechanism (8) being a lens.
  8. A device (5) according to claim 1, characterized by a directional coupler and a multiplier structure multiplying the oscillator frequency to reach the desired terahertz band after the amplifier enabling amplifying the radiation generated by the oscillator provided on the transceiver (6), on which frequency modulation is applied by using signal generator.
  9. A device (5) according to claim 1, characterized by the transceiver (6) comprising a harmonic scrambler.
  10. A device (5) according to claim 8, characterized by the oscillator generating radiation having a frequency in the range of 10-11 GHz.
  11. A device (5) according to claim 8 and 10, characterized by the amplifier amplifying the frequency of the radiation at least 48 times.
  12. A device (5) according to claim 8 characterized by the oscillator generating radiation having a frequency in the range of 13-15 GHz.
  13. A device (5) according to claim 8 and 12, characterized by the amplifier amplifying the frequency of the radiation at least 36 times.
  14. A device (5) according to any one of the preceding claims, characterized by using frequency modulated continuous wave (FMCW) measurement method to examine insulation panel (1) characteristics.
PCT/EP2019/057657 2018-04-17 2019-03-27 Frequency modulated continuous wave device for examining insulating panels and corresponding method WO2019201564A1 (en)

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TRA2018/05457 2018-04-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020078866A1 (en) * 2018-10-15 2020-04-23 Covestro Deutschland Ag Method and apparatus for detecting defects in the insulation of a cooling device
CN113823888A (en) * 2021-05-06 2021-12-21 北京理工大学 Dual-frequency matching, second harmonic terahertz mixer based on high temperature superconducting technology
US12196669B2 (en) 2021-12-27 2025-01-14 Samsung Electronics Co., Ltd. Inspection apparatus and method of inspecting wafer

Citations (5)

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Publication number Priority date Publication date Assignee Title
US6096416A (en) * 1997-06-26 2000-08-01 Altenberg; Milton J. Metal sandwich panels
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