A sensor for remote detection of objects in a surveillance zone (10) is preferably intended to be used in an article surveillance zone, which further has at least one transmitter means (11, 13) and at least one receiver means (12, 15) for transmitting and receiving, respectively, electromagnetic rad
A sensor for remote detection of objects in a surveillance zone (10) is preferably intended to be used in an article surveillance zone, which further has at least one transmitter means (11, 13) and at least one receiver means (12, 15) for transmitting and receiving, respectively, electromagnetic radio-frequency signals in the surveillance zone, and at least one modulating means (16) for generating a modulation field in the surveillance zone. The sensor is arranged to transmit an electromagnetic reply signal at the reception of electromagnetic energy from the transmitter means, said reply signal being dependent on the modulation field and being receivable by the receiver means. A magnetic element (23) is arranged in a sensor body (21; 101, 102), the magnetic properties of the element being controllable by a magnetic field acting as the modulation field, wherein the amplitude of the reply signal from the sensor is controllable through the magnetic modulation field.
대표청구항▼
[ What is claimed is:] [1.]1. A sensor for remote detection of objects in a surveillance zone (10), preferably for use in an article surveillance system, which further comprises at least one transmitter means (11, 13) and at least one receiver means (12, 15) for transmitting and receiving, respectiv
[ What is claimed is:] [1.]1. A sensor for remote detection of objects in a surveillance zone (10), preferably for use in an article surveillance system, which further comprises at least one transmitter means (11, 13) and at least one receiver means (12, 15) for transmitting and receiving, respectively, electromagnetic radio-frequency signals in the surveillance zone, and at least one modulating means (16) for generating a modulation field in the surveillance zone, said sensor being arranged to transmit an electromagnetic reply signal at the reception of electromagnetic energy from said transmitter means, and said reply signal being dependent on said modulation field and being receivable by said receiver means, characterized bya magnetic element (23) arranged in a sensor body (21; 101, 102) and having a magnetic property, which is controllable by a magnetic field acting as said modulation field, so that the amplitude of the reply signal from the sensor is modulated by said magnetic modulation field.
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이 특허에 인용된 특허 (10)
Herman Fred W. (Tampa FL) Charlot ; Jr. Lincoln H. (St. Petersburg FL) Lian Ming R. (Clearwater FL) Drew Douglas A. (Tampa FL), Adjusting magnetic bias field intensity in EAS presence detection system to enhance detection.
Strom-Olsen John O. (443 Lansdowne Ave. Montreal CAX H3Y 2V4) Rudkowski Piotr Z. (5067 Bourassa Pierrfonds CAX H8Z 2K1), Ferromagnetic fibers having use in electronical article surveillance and method of making same.
Liu Nen-chin (Parkland FL) Lian Ming-Ren (Clearwater FL) Cantey Jimmy (Fort Lauderdale FL), Transverse magnetic field annealed amorphous magnetomechanical elements for use in electronic article surveillance syste.
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