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Detector
 
Part of the receiver that demodulates the RF signal and converts it to a lower frequency signal. Most detectors are phase sensitive (e.g., quadrature detector / demodulator) and will also give phase information about the RF signal.
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  News & More:
A detector you can wear
Thursday, 23 August 2012   by phys.org    
Ultrasensitive Detector Pinpoints Big Problem in Tiny Fetal Heart
Tuesday, 6 April 2010   by www.sciencedaily.com    
More and More States Adopt Requirements for Ferromagnetic Detectors for MRI Safety
Monday, 19 March 2012   by www.pr.com    
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Product Detector
 
Product detector or 'doubly balanced mixer (DBM)' is an electrical device to combine two signals. In MRI, used in the quadrature detector.
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Product Detector
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The Basics of MRI
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Metal Detector CoilMRI Resource Directory:
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Metal detector coils can be used to find hidden ferromagnetic materials inside of clothes or the body of persons before entering a scanning room. Magnetic fields attract ferromagnetic objects with forces, which can be dangerous for humans and MRI machines.
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Quadrature Detector
 
The quadrature detector is a part of the receiver that converts the high-frequency MRI signal to a lower frequency. This phase sensitive detector or demodulator detects the components of the signal in phase with a reference signal and 90° out of phase with the reference signal. The modulated signal contains i.e. the frequency range across the field of view encoded by the frequency encoding gradient. This may be performed by either analog or digital means.
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Phase Sensitive Detector
 
Detector that detects the phase of the signal relative to the phase of a reference oscillator. Phase sensitive detectors are used in MR transmitters (where they form part of the frequency synthesis pathway) and MR receivers (where they are used to down-convert the MR signal to audio-frequencies prior to digitization). This device type includes modulators, demodulators and mixers.
See Quadrature Detector.
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