Radiation detector
First Claim
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1. An electrical circuit device for detecting free space radio frequency radiation fields, said device including:
- a plurality of spaced conductive strips in the form of thin resistive films whose thickness is small compared to the skin depth at the radio frequency, said strips being connected in an electrically conductive path,and a non-metallic housing for said strips including means for surrounding said strips with dielectric material for passing said radiation fields to said strips,the area of spacing between adjacent ones of said strips being greater than the area of said strips so that the impedance of said strips is largely resistive over a broad band of radio frequencies.
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Abstract
A detection device for electromagnetic radiation uses strips of thin resistive films connected in electrically conductive paths with the area of spacing between adjacent ones of the strips being greater than the area of the strips to achieve an impedance which is largely resistive over a broad band of radio frequencies. The strips are mounted in dielectric material and exposed to free space radiation. A radiation hazard meter is produced with thermally sinked thermocouple elements forming the resistive strips.
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Citations
33 Claims
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1. An electrical circuit device for detecting free space radio frequency radiation fields, said device including:
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a plurality of spaced conductive strips in the form of thin resistive films whose thickness is small compared to the skin depth at the radio frequency, said strips being connected in an electrically conductive path, and a non-metallic housing for said strips including means for surrounding said strips with dielectric material for passing said radiation fields to said strips, the area of spacing between adjacent ones of said strips being greater than the area of said strips so that the impedance of said strips is largely resistive over a broad band of radio frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrical circuit device for detecting radio frequency radiation, said device including:
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a plurality of spaced conductive strips in the form of thin resistive films whose thickness is small compared to the skin depth at the radio frequency, said strips having substantial resistance and being connected in an electrically conductive path, a first group of said strips being parallel and a second group of said strips being parallel and transverse to said first strips to form a grid, the spacing between adjacent ones of said parallel strips being greater than the width of said strips, so that the impedance of said grid of strips to free space radio frequency radiation is largely resistive over a broad band of radio frequencies, and dielectric means for mounting said strips for exposure to free space radiation fields. - View Dependent Claims (9)
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10. A thermoelectric device for radiation detection comprising:
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a plurality of conductive means forming thermocouples formed of different thin resistive films connected in a sequence of alternatingly different films connected to form a plurality of cold junctions and hot junctions therebetween; and dielectric means spaced from said hot junctions and having a high thermal conductivity and connecting said cold junctions in thermally conductive relation to provide a substantially uniform reference temperature for said cold junctions. - View Dependent Claims (11, 12, 13, 32, 33)
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14. An electrical circuit device for detecting free space radio frequency radiation fields, said device including:
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a plurality of spaced conductive strips in the form of thin resistive films whose thickness is small compared to the skin depth at the radio frequency, said strips being connected in an electrically conductive path, and a non-metallic housing for said strips including means for surrounding said strips with dielectric material for passing said radiation fields to said strips, said strips being arranged to present a generally resistive impedance substantially greater than that of free space to said radio frequency radiation fields and having a negligible reflective characteristic, said detecting device having the property that, for a value of ohms per square equal to free space, power absorption from free space by said strips is not a maximum. - View Dependent Claims (15)
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16. A radiation transformer for radiation fields at radio frequencies comprising:
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a non-metallic housing containing a plurality of spaced resistive strips with the spacing between said strips being large compared to the width of the strips, and means for deriving electrical signals from said strips; said transformer having the property that, for a value of ohms per square equal to free space, power absorption from free space by the transformer is not a maximum. - View Dependent Claims (17, 18)
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19. A device for detecting free space radio frequency radiation, said device comprising:
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an electrically continuous resistive strip with, separate portions extending in transverse directions over an area and having a largely resistive impedance effective over said area to free space radio frequency radiation and substantially greater than that of free space and having a negligible reflective characteristic, said detecting device having the property that, for a value of ohms per square equal to free space, power absorption from free space by the detecting device is less than a maximum. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification