Device for punctual measurement of a radiofrequency magnetic field with constant amplitude and frequency
First Claim
1. Device for measuring a radiofrequency magnetic field, characterised by the fact that it comprises the following, on a common support (10):
- a coil forming a primary reception antenna, a voltage controlled oscillator, monitored so that its output frequency depends on the amplitude of the magnetic field received on the coil forming the primary antenna;
an absorption modulation load connected to the oscillator output;
a secondary antenna (22) sensitive to the magnetic field influenced by the absorption modulation resulting from the power supply to the load by the voltage controlled oscillator, and means (30) for using the available signal on the secondary antenna (22).
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Abstract
The invention concerns a device for measuring a radiofrequency magnetic field, characterised in that it comprises on a common support (10): a coil forming a primary reception antenna; a voltage-controlled oscillator, monitored so that its output frequency depends on the amplitude of the magnetic field received on the coil forming primary antenna; an absorption modulation load connected to the oscillator output; a secondary antenna (22) sensitive to the magnetic field influenced by the absorption modulation resulting from the power supply load by the voltage-controlled oscillator, and means (30) for operating the available signal on the secondary antenna (22).
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Citations
12 Claims
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1. Device for measuring a radiofrequency magnetic field, characterised by the fact that it comprises the following, on a common support (10):
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a coil forming a primary reception antenna, a voltage controlled oscillator, monitored so that its output frequency depends on the amplitude of the magnetic field received on the coil forming the primary antenna;
an absorption modulation load connected to the oscillator output;
a secondary antenna (22) sensitive to the magnetic field influenced by the absorption modulation resulting from the power supply to the load by the voltage controlled oscillator, and means (30) for using the available signal on the secondary antenna (22). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification