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Visible light absorption element, and temperature visualization device and infrared ray visualization device equipped with same UPDATE_EN

Foreign code F190009920
File No. 08367-US
Posted date Aug 26, 2019
Country United States of America
Application number 201715677428
Gazette No. 20170370777
Date of filing Aug 15, 2017
Gazette Date Dec 28, 2017
International application number JP2016053898
International publication number WO2016132979
Date of international filing Feb 10, 2016
Date of international publication Aug 25, 2016
Priority data
  • P2015-031497 (Feb 20, 2015) JP
  • 2016JP53898 (Feb 10, 2016) WO
Title Visible light absorption element, and temperature visualization device and infrared ray visualization device equipped with same UPDATE_EN
Abstract In accordance with heat received from a target object, a visible light absorption element 10 changes a frequency component of visible light to reflect or transmit. The visible light absorption element 10 possesses a resonance frequency included in a visible light frequency region. The visible light absorption element 10 absorbs visible light of the resonance frequency. The visible light absorption element 10 thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency.
Outline of related art and contending technology BACKGROUND ART
Temperature measuring devices are used to measure a temperature of a target object. The temperature measuring devices are based on various principles. Examples of the devices include a device utilizing thermal expansion of a substance, and a device using a thermocouple that converts a temperature difference into a voltage.
These temperature measuring devices generally measure a temperature of a target object in a state in contact with the target object.
Meanwhile, there also are devices, such as thermographic cameras, that measure a temperature of a target object in a state not in contact with the target object. A thermographic camera is described, for example, in Patent Literature (PTL) 1 specified below. The thermographic camera includes a two-dimensional array of infrared detecting elements arranged in two dimensions. The thermographic camera receives infrared rays from a target object, at the two-dimensional array, and on the basis of the received infrared rays, visualizes the temperature distribution of the target object, for example, by displaying the distribution on a display.
The following PTL 2 and Non-Patent Literatures (NPL) 1 and 2 are related to configuration examples of the present invention described later.
Scope of claims [claim1]
1. A visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element,
the visible light absorption element thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency,
the visible light absorption element has a ring shape, and at a part in a circumferential direction of the ring shape, a space discontinuing the ring shape in the circumferential direction is provided, and
the visible light absorption element is formed of a material including a conductive material, and when visible light of the resonance frequency enters on the visible light absorption element, the visible light absorption element resonates with the visible light so that an electric current flows in the circumferential direction in the visible light absorption element.

[claim2]
2. A visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element,
wherein the visible light absorption element thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency,
wherein the visible light absorption element comprises:
an inductor portion functioning as a coil having inductance (L); and
a capacitor portion functioning as a capacitor having capacitance,
wherein the inductor portion and the capacitor portion constitutes an LC circuit,
the LC circuit possesses the resonance frequency, and
thermal deformation of one or both of the inductor portion and the capacitor portion causes the resonance frequency to be changed, and
wherein the visible light absorption element is constituted by two flat-plate-shaped portions arranged at an interval therebetween, the interval forms the capacitor portion, and each of the flat-plate-shaped portions forms the inductor portion, or
the visible light absorption element is constituted by two L-shaped portions arranged at an interval therebetween and having an L-shaped section, the interval forms the capacitor portion, and each of the L-shaped portions forms the inductor portion, or
the visible light absorption element is constituted by two comb-shaped portion arranged at an interval therebetween, between a plurality of tooth portions in one of the comb-shaped portions, a tooth portion in the other of the comb-shaped portions is positioned, the interval forms the capacitor portion, and each of the comb-shaped portions forms the inductor portion, or
the visible light absorption element is constituted by a helical-shaped portion, the helical-shaped portion forms the inductor portion, and a helical interval of the helical-shaped portion forms the capacitor portion.

[claim3]
3. The visible light absorption element according to claim 1, wherein the visible light absorption element includes first and second layers superimposed to each other in a radial direction of the ring shape,
at least one of the first and second layers is formed of the conductive material, and
the first and second layers have different thermal expansion coefficients.

[claim4]
4. The visible light absorption element according to claim 1, wherein the visible light absorption element has inductance depending on a dimension of the ring shape, and has capacitance depending on the space in the circumferential direction, and an LC circuit possessing the resonance frequency is configured by the inductance and the capacitance.

[claim5]
5. An infrared ray visualization device comprising:
a visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit;
an element supporting body in which a large number of the visible light absorption elements are integrated; and
at least one infrared ray absorbing portion thermally corrected to the respective visible light absorption elements,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element, and
the visible light absorption element thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency.

[claim6]
6. The infrared ray visualization device according to claim 5, wherein a large number of the visible light absorption elements are integrally connected to the one infrared ray absorbing portion or a large number of the infrared ray absorbing portions.
  • Inventor, and Inventor/Applicant
  • Tanaka Takuo
  • RIKEN
IPC(International Patent Classification)

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