Electromagnetic radiation detector

• US 3,927,375 A
• Filed: 02/04/1974
• Issued: 12/16/1975
• Est. Priority Date: 02/16/1973
• Status: Expired due to Term

• Current Assignee: Bernard Lanoe, Elisabeth D.E. Metz
• Original Assignee: Bernard Lanoe, Elisabeth D.E. Metz
• Inventors: Lanoe, Bernard, DE Metz, Elisabeth
• Primary Examiner(s): Libman, George H.
• Application Number:
  US05/439,123
• Time in Patent Office: 680 Days
• Field of Search: 325/149,363,364,67 340/228R,283 313/499 40/2.2,1.5,129A 250/39HT 240/6.4W 343/1ME,795,703 315/136
• US Class Current: 343/894
• CPC Class Codes: G01R 29/0857 Dosimetry, i.e. measuring the time integral of radiation intensity; Level warning devices for personal safety use nuclear radiation dosimetry G01T
• CPC Class Codes: G01R 29/0892 Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value

Abstract

An electromagnetic radiation detector unit includes an alarm device responsive to voltage measurements. The detector unit includes a radiation receiving antenna, a voltage detector connected to the antenna, a threshold amplifier switch connected to the output of the voltage detector and a diode which is triggered by the amplifier switch and which serves as the alarm device. The components of the unit are carried by a printed circuit card or formed by printed circuits on the card. The card is formed as an individual badge used by the wearer in detecting electromagnetic radiation hazards and carries identity and other indicia on the face thereof.

Claims

1. An electromagnetic radiation detector including an alarm device, the improvement comprising a receiving antenna for detecting radiation, a voltage detector connected to said antenna, a threshold amplifier switch connected to the output of said voltage detector, and a suitably polarized electroluminescent diode, connected to the output of said amplifier switch, serving as said alarm device, said receiving antenna comprising a dipole antenna including radiation receiving dipole elements, the components of said detector including said dipole elements being formed on a printed circuit card, said card including a first hole for housing said DC source, and a second hole for mounting said diode, said components being carried by the back of said card and printed circuit connections for said components being located on the front of said card, the device further comprising a cover located on the front of said card including an aperture therein through which said diode extends, said cover for said card including identity and work identification indicia thereon.

2. In an electromagnetic radiation detector including an alarm device, the improvement comprising a receiving antenna for detecting radiation, a voltage detector connected to said antenna, a threshold amplifier switch connected to the output of said voltage detector, and a suitably polarized electroluminescent diode, connected to the output of said amplifier switch, serving as said alarm device, said receiving antenna comprising a dipole antenna, including radiation receiving dipole elements, the components of said detector including said dipole elements being formed on a printed circuit card, said card including a first hole for housing said DC source and a second hole for mounting said diode, said card being shaped as a badge capable of being worn or carried by a user, and said diode being located on said badge relatIvely near the upper end thereof to ensure visibility of the diode when the badge is carried in the pocket of a wearer.

3. An electromagnetic radiation detector as claimed in claim 2 wherein said badge includes identity indicia at a location on the front thereof above said diode and service instructions at location on the front thereof beneath said diode.

4. In an electromagnetic radiation detector including an alarm device, the improvement comprising a receiving antenna for detecting radiation, a voltage detector connected to said antenna, a threshold amplifier switch connected to the output of said voltage detector, and a suitably polarized electroluminescent diode, connected to the output of said amplifier switch, serving as said alarm device, said voltage detector comprising a rectifier bridge and said receiving antenna comprising a dipole antenna, the ends of one diagonal of said rectifier bridge being connected to the two radiation receiving elements of said dipole and the ends of the other diagonal being respectively connected to ground and to the input of said threshold amplifier switch, said threshold amplifier switch comprising a transistor connected in a common emitter configuration, a DC source being connected in series with said electroluminescent diode and the emitter-collector circuit of said transistor and the base of said transistor forming the input of said threshold amplifier switch, said electroluminescent diode being directly connected to said emitter-collector circuit of said transistor, the components of said detector including said dipole elements being formed on a printed circuit card, said card including a first hole for housing said DC source and a second hole for mounting said diode, said components being carried by the back of said card and printed connections for said components being located on the front of said card, said device further comprising a cover located on the front of said card and including an aperture therein through which said diode extends.

5. An electromagnetic radiation detector as claimed in claim 4 wherein said cover for said card includes identity and work identification indicia thereon.

6. In an electromagnetic radiation detector including an alarm device, the improvemment comprising a receiving antenna for detecting radiation, a voltage detector connected to said antenna, a threshold amplifier switch connected to the output of said voltage detector, and a suitably polarized electroluminescent diode, connected to the output of said amplifier switch, serving as said alarm device, said voltage detector comprising a rectifier bridge and said receiving antenna comprising a dipole antenna, the ends of one diagonal of said rectifier bridge being connected to the two radiation receiving elements of said dipole and the ends of the other diagonal being respectively connected to ground and to the input of said threshold amplifier switch, said threshold amplifier switch comprising a transistor connected in a common emitter configuration, a DC source being connected in series with said electroluminescent diode and the emitter-collector circuit of said transistor and the base of said transistor forming the input of said threshold amplifier switch, said electroluminescent diode being directly connected to said emitter-collector circuit of said transistor, the components of said detector including said dipole elements being formed on a printed circuit card, said card including a first hole for housing said DC source and a second hole for mounting said diode, said card being shaped as a badge capable of being worn or carried by a user, said diode being located on badge relatively near the the upper end thereof to ensure visibility of the diode when the badge is carried in the pocket of a wearer.