Device for direct and continuous receiving and measuring of electrical magnetic and acoustic signals
First Claim
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1. A direct and continuous receiving and measuring device for electrical, magnetic or acoustic signals comprising:
- pick-up means for picking up said electrical, magnetic or acoustic signals;
first filtering means having an input connected to said pick-up means and dividing the frequency range provided by said pick-up means into a plurality of frequency subranges, each frequency subrange being selected by a band-pass filter;
first selector means adapted to be connected to the output of said band-pass filters;
local oscillator means comprising a quartz oscillator delivering a reference frequency, a circuit loop comprising in series a phase comparator having first and second inputs and an output and connected by said first input to said quartz oscillator, a voltage controlled oscillator connected to the output of said phase comparator and a divider connected between an output of said voltage controlled oscillator and said second input of said phase comparator, said circuit loop further comprises a low-pass filter connected between the phase comparator and the voltage controlled oscillator and delivering an error signal to lock the voltage controlled oscillator on or close to the frequency to be detected;
mixing means connected to said output of said voltage controlled oscillator;
second filtering means comprising a plurality of low-pass filters mounted in parallel, an input of said second filtering means being connected to an output of said mixing means;
second selector means adapted to be connected to an output of said low-pass filters of said second filtering means; and
measuring means connected to said second selector means for measuring the value of the signals detected by the pick-up means.
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Abstract
A direct and continuous receiving and measuring device for electrical, magnetic and acoustic signals comprises an amplifier stage and a broadband filtering stage at the input, a local oscillator for supplying a reference signal, a measuring stage, a mixer to which the local oscillator and the broadband filtering stage are connected and a low frequency filtering stage connected to the mixer.
The invention also includes the process of carrying out the measurement.
31 Citations
15 Claims
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1. A direct and continuous receiving and measuring device for electrical, magnetic or acoustic signals comprising:
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pick-up means for picking up said electrical, magnetic or acoustic signals; first filtering means having an input connected to said pick-up means and dividing the frequency range provided by said pick-up means into a plurality of frequency subranges, each frequency subrange being selected by a band-pass filter; first selector means adapted to be connected to the output of said band-pass filters; local oscillator means comprising a quartz oscillator delivering a reference frequency, a circuit loop comprising in series a phase comparator having first and second inputs and an output and connected by said first input to said quartz oscillator, a voltage controlled oscillator connected to the output of said phase comparator and a divider connected between an output of said voltage controlled oscillator and said second input of said phase comparator, said circuit loop further comprises a low-pass filter connected between the phase comparator and the voltage controlled oscillator and delivering an error signal to lock the voltage controlled oscillator on or close to the frequency to be detected; mixing means connected to said output of said voltage controlled oscillator; second filtering means comprising a plurality of low-pass filters mounted in parallel, an input of said second filtering means being connected to an output of said mixing means; second selector means adapted to be connected to an output of said low-pass filters of said second filtering means; and measuring means connected to said second selector means for measuring the value of the signals detected by the pick-up means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A direct and continuous receiving and measuring device for electrical, magnetic or acoustic signals comprising:
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a pick-up means for picking up said electrical, magnetic or acoustic signals; first filtering means having an input connected to said pick-up means and dividing the frequency range provided by said pick-up means into a plurality of frequency subranges, each frequency subrange being selected by a band-pass filter; first selector means adapted to be connected to the output of said band-pass filters; local oscillator means comprising a quartz oscillator delivering a reference frequency, and first and second circuit loops, said first circuit loop comprising in series a first phase comparator having first and second inputs and an output connected by said first input to said quartz oscillator, a first voltage controlled oscillator connected to the output of said first phase comparator and a first divider connected between an output of said first voltage controlled oscillator and the second input of said phase comparator, said second loop comprising at least a second phase comparator connected to the output of said first voltage controlled oscillator and a second voltage controlled oscillator having an output; mixing means connected to said output of said second voltage controlled oscillator; second filtering means comprising a plurality of low-pass filters mounted in parallel, an input of said second filtering means being connected to an output of said mixer means; second selector means adapted to b connected to an output of said low-pass filters of said second filtering means; and measuring means connected to said second selector means for measuring the value of the signals detected by the pick-up means. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification