 Novel battery assembly |
| The present invention is directed to a new and improved energy cell or battery which comprises one ... |
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| Lead/acid battery having horizontal plates |
| In FIG. 1, a battery 10 is shown which is comprised of cells individually designated by 11. The ... |
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| Leadless capacitors |
| We claim: 1. A method of making lead-less solid electrolytic capacitor comprising: providing a lead ... |
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| Extended life capacitor and method |
| Accordingly, the problem to be solved is how to construct a capacitor of high farad capacity in a ... |
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| Aluminum capacitor plate for electrolytic capacitor and process for making the same |
| The present invention aims at solving the problems pointed out with respect to the known capacitor ... |
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| Coaxial type capacitor for pulse generator |
| OF THE PREFERRED EMBODIMENT FIG. 1 shows a vertical cross section of a coaxial type capacitor ... |
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| Integrated bus bar/multilayer ceramic capacitor module |
| Accordingly, it is the object of the present invention to provide for a high-voltage, low-volume ... |
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| Bonding fired multilayer capacitors into a stack |
| The present invention overcomes the aforementioned fragility of prior assemblies of fired ... |
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| Gas-dynamic spraying method for applying a coating |
| We claim: 1. A gas-dynamic spraying method for applying a coating to an article, the method ... |
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| Multiple layer capacitor mounting arrangement |
| In FIG. 1, a capacitor 10, which is in the form of a multiple layer capacitor, includes a first ... |
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Method and apparatus for suppressing noise during nondestructive eddy current testing
| Details |
Inventors: Jamison, Thomas D.;
Assignee: Combustion Engineering, Inc. (Windsor, CT)
Primary Examiner: Strecker; Gerard R.
Assistant Examiner:
Attorney, Agent or Firm: Habelt; William W.
A filter apparatus (2) is disclosed for filtering out any reoccurring noise (5) present in a defect signal (1) received from a flaw detection device (4) such as an eddy current test probe. Filter circuit means (10) receives the defect signal generated by the flaw detector device and produces an output signal (5) duplicative of any reoccurring noise present therein. A differential amplifier (50) subtracts the output signal (5) of the filter circuit means from the defect signal (1) generated by the flaw detection device and amplifies the difference. A filtered defect signal (9) void of any reoccurring noise is thereby produced. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, and more particularly to FIGS.
1 and 2 thereof, there is depicted in block diagram form alternate embodiments of a filter apparatus 2 designed in accordance with the present invention.
The incoming defect signal 1 generated by the eddy current probe sensing means 4 is received by the filter apparatus 2 and processed therein to remove any reoccurring, i.
e.
, repetitive, noise present in the incoming defect signal 1 thereby producing as the output of the filter apparatus 2 a filtered defect signal 9.
In accordance with the present invention, the filter apparatus 2 comprises filter circuit means 10 for receiving the defect signal 1 generated by the eddy current probe sensing means 4 and for producing as its output a noise signal 5 duplicative of any reoccurring noise present in the incoming defect signal 1, and a differential amplifier 50 for subtracting the noise signal 5 generated in the filter circuit means from the incoming defect signal 1 and amplifying the difference therebetween.
The noise signal 5 produced in filter circuit means 10 has the same frequency, phase and amplitude as the reoccurring noise present in the incoming defect signal 1.
By subtracting the noise signal 5 from the incoming defect signal 1, the filtered defect signal 9 is obtained.
In the embodiment of the present invention shown in FIG.
1, the filter circuit means 10 comprises a phase-locked loop 20, a gain controlled amplifier 30 and a comparator 40.
The phase-locked loop 20 is a versatile feedback system, well known in the art, that provides frequency selective filtering without the use of inductors.
A phase-locked loop contains three basic functional elements: a phase comparator, a voltage controlled oscillator and a low pass filter.
A phase-locked loop is generally packaged as an integrated circuit.
The phase comparator compares the phase and frequency of input signal 1 to the phase and frequency of the signal generated by the voltage controlled oscillator and produces an error voltage proportional to the phase and frequency difference therebetween
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Metal Working 
