EP0019911A1 - Cible d'enregistrement d'images thermiques - Google Patents

Cible d'enregistrement d'images thermiques Download PDF

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Publication number
EP0019911A1
EP0019911A1 EP80102968A EP80102968A EP0019911A1 EP 0019911 A1 EP0019911 A1 EP 0019911A1 EP 80102968 A EP80102968 A EP 80102968A EP 80102968 A EP80102968 A EP 80102968A EP 0019911 A1 EP0019911 A1 EP 0019911A1
Authority
EP
European Patent Office
Prior art keywords
thermal imaging
imaging plate
holes
thermal
plate according
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP80102968A
Other languages
German (de)
English (en)
Other versions
EP0019911B1 (fr
Inventor
Peter-Wilhelm Dr. Dipl.-Phys. Steinhage
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heimann GmbH
Original Assignee
Heimann GmbH
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 Heimann GmbH filed Critical Heimann GmbH
Publication of EP0019911A1 publication Critical patent/EP0019911A1/fr
Application granted granted Critical
Publication of EP0019911B1 publication Critical patent/EP0019911B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/39—Charge-storage screens
    • H01J29/45—Charge-storage screens exhibiting internal electric effects caused by electromagnetic radiation, e.g. photoconductive screen, photodielectric screen, photovoltaic screen
    • H01J29/458—Charge-storage screens exhibiting internal electric effects caused by electromagnetic radiation, e.g. photoconductive screen, photodielectric screen, photovoltaic screen pyroelectrical targets; targets for infrared or ultraviolet or X-ray radiations

Definitions

  • the invention relates to a thermal imaging plate which, via a physical conversion effect, generates a corresponding image of locally distributed property from the thermal radiation corresponding to a thermal image and incident locally distributed, e.g. a charge image via a pyroelectric effect, i.e. an image with locally distributed electrical charge, with a conversion layer that is screened to prevent lateral heat conduction and the associated image blur.
  • a thermal imaging plate which, via a physical conversion effect, generates a corresponding image of locally distributed property from the thermal radiation corresponding to a thermal image and incident locally distributed, e.g. a charge image via a pyroelectric effect, i.e. an image with locally distributed electrical charge, with a conversion layer that is screened to prevent lateral heat conduction and the associated image blur.
  • Such a thermal imaging plate serves in the most general sense as a receiver of a thermal image which is imaged on the plate via an optical device and generates a corresponding locally distributed temperature relief there by absorption and heating.
  • the thermal imaging plate has a conversion layer as a carrier of the temperature relief, which translates the temperature relief into a usable property.
  • this can be a locally distributed charge relief via the pyroelectric effect mentioned, but also a voltage relief with respect to a base electrode via a thermoelectric effect, or an image of locally distributed electrical resistance via a thermoresistive effect.
  • electrical quantities as image content are conceivable; it can also be others such as a local distribution of the optical refractive index generated by the thermal radiation.
  • the suitable effect will be selected.
  • the most common evaluation of the generated image is the scanning via a sharply focused electron beam in an image pickup tube, which generates an electrical signal corresponding to the time. This is then either saved or displayed as a visible image via a picture tube.
  • the build-up of the temperature relief through the thermal radiation imaged on the thermal imaging plate takes place according to an exponential function. There has to be one hand time be given enough to allow the T e mperaturrelief can build up in the converting layer and enables a sufficient intensity of the image produced by the converting layer. On the other hand, the sharpness of the image is determined by the lateral thermal conductivity of the conversion layer or of the layers which are still present. The built-up local temperature differences have a tendency to flow into one another and thus reduce the image sharpness in accordance with the lateral thermal conductivity.
  • the present invention is based on the object of providing the grid of the conversion layer in such a way that sufficient mechanical stability is achieved within the conversion layer, but a separate carrier layer as a support film is not necessary.
  • the holes can be designed differently. It is essential that the grid elements lying in the mesh of the line network are not completely separated from one another, i.e. that the entire reaction layer represents a coherent body with sufficient mechanical stability and breaking strength. ' By designing the holes, the lateral heat conduction can be restricted as desired.
  • a plurality of holes are combined to form elongate slots which are separated from one another in the course of a line by remaining webs of the conversion layer.
  • the holes separated from each other in this case are elongated holes.
  • Another possibility is not to make this identical for each crossing point, but to carry out a structure in such a way that there is a web at each crossing point of the network lines, the slots in the course of a line each extending over at least two meshes and the successive slots webs separating this line are each interrupted by a slot of a crossing line.
  • a great advantage of a thermal imaging plate according to the invention proves itself in those applications where a continuous signal electrode is required for an electrical reading of the thermal image.
  • This is the case, for example, with the target of a pyroelectric image pickup tube, where the slotted surface side advantageously faces the incident heat radiation. Then the slots can be very narrow; there is no need to consider the scanning electron beam, which then has a continuous surface side facing it. But the slotted surface side must have a continuous sig wear electrode, which is very difficult to apply in the known slotting with continuous channels.
  • there is a perforated but coherent surface which can easily be covered with a continuous conductive electrode layer.
  • the thermal imaging plate carries an electrically conductive layer as a signal electrode on that surface side which faces the incident thermal radiation and is used as a target in an imaging tube and further preferably made of pyroelectric or thermoresistive material.
  • FIG. 1 shows a section of a top view of a thermal imaging plate according to the invention from for example pyroelectric triglycine sulfate single crystal.
  • a grid is formed by holes 1 being drilled in the thermal imaging plate along the lines of a square mesh-forming network.
  • the layer prisms in the mesh with a square collecting area represent the picture elements of the thermal imaging plate that are assigned to the individual pixels.
  • the lateral conductivity present between the picture elements is set by the webs between the mutually adjacent holes 1. This lateral heat conduction can be kept small by a large number of holes per mesh.
  • FIG. 2 An arrangement according to FIG. 2 is better, where the holes are expanded into elongated holes or slots 2. Compared to the rows of holes, all but the webs remaining on the knots fall away. The lateral heat conduction between the picture elements is very low. Sufficient breaking strength can be guaranteed by the coherent laminate.
  • the thermal imaging plate is sufficiently self-supporting.
  • FIG. 3 shows the design of a thermal imaging plate according to the invention, where a grid of rows of slits with remaining webs is provided on the mesh knots, but where these slits 3 do not pass through the entire layer thickness. This creates a continuous sub-layer at the bottom of the slots 3. It is also shown for example for the Ver used as a target in an image pickup tube is an applied to the slotted surface side for heat radiation permeable and electrically conductive layer 4 made of, for example, chromium-nickel or titanium, which serves as a signal electrode.
  • Rows of slots intersect in the manner of rows and columns and form square meshes.
  • the slots 5 of the rows and the slots 6 of the columns each extend over two mesh sides. However, they overlap in such a way that a web is slit between two row slots 5 through a column slot 6 and vice versa. Due to such a structure, there is only a narrow web between adjacent grid elements for possible lateral heat conduction. Diagonal lateral heat conduction is almost completely prevented. However, the material relationship is sufficient for the mechanical strength of the entire thermal imaging plate. The formation of continuous fault lines is largely prevented.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radiation Pyrometers (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
EP80102968A 1979-05-30 1980-05-28 Cible d'enregistrement d'images thermiques Expired EP0019911B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2922031A DE2922031C2 (de) 1979-05-30 1979-05-30 Wärmebildaufnahmeplatte
DE2922031 1979-05-30

Publications (2)

Publication Number Publication Date
EP0019911A1 true EP0019911A1 (fr) 1980-12-10
EP0019911B1 EP0019911B1 (fr) 1982-08-25

Family

ID=6072078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102968A Expired EP0019911B1 (fr) 1979-05-30 1980-05-28 Cible d'enregistrement d'images thermiques

Country Status (4)

Country Link
US (1) US4319135A (fr)
EP (1) EP0019911B1 (fr)
JP (1) JPS55159126A (fr)
DE (1) DE2922031C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492160A1 (fr) * 1980-10-14 1982-04-16 Thomson Csf Cible pyroelectrique et tube de prise de vues muni d'une telle cible

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0743215A (ja) * 1993-05-24 1995-02-14 Mitsubishi Electric Corp 赤外線検知素子
US5485010A (en) * 1994-01-13 1996-01-16 Texas Instruments Incorporated Thermal isolation structure for hybrid thermal imaging system
US5969369A (en) * 1997-08-29 1999-10-19 Fogarty; Charles M. Infrared emissive module

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2137163A1 (fr) * 1971-05-14 1972-12-29 Thomson Csf
GB2003004A (en) * 1977-08-18 1979-02-28 Philips Nv Improvement of signal/noise ratio in pyroelectric vidicon
FR2400766A1 (fr) * 1977-08-20 1979-03-16 English Electric Valve Co Ltd Tube de prise de vues thermique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919555A (en) * 1974-10-17 1975-11-11 Philips Corp Direct view infra-red to visible light converter
FR2345815A1 (fr) * 1976-01-30 1977-10-21 Thomson Csf Nouveau detecteur solide de rayonnement ionisant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2137163A1 (fr) * 1971-05-14 1972-12-29 Thomson Csf
GB2003004A (en) * 1977-08-18 1979-02-28 Philips Nv Improvement of signal/noise ratio in pyroelectric vidicon
FR2400766A1 (fr) * 1977-08-20 1979-03-16 English Electric Valve Co Ltd Tube de prise de vues thermique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FERROELECTRICS, Band 10, Nr. 1-4, 1976 London (GB) B. SINGER et al.: "Pyroelectric vidicon with improved resolution", Seiten 103 bis 107. * Seite 104, letzter Absatz bis Seite 105, rechte Spalte; Figur 3d * *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492160A1 (fr) * 1980-10-14 1982-04-16 Thomson Csf Cible pyroelectrique et tube de prise de vues muni d'une telle cible

Also Published As

Publication number Publication date
DE2922031A1 (de) 1980-12-11
EP0019911B1 (fr) 1982-08-25
JPS55159126A (en) 1980-12-11
US4319135A (en) 1982-03-09
DE2922031C2 (de) 1982-06-03

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