The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 2020
Filed:
Sep. 17, 2015
Forschungszentrum Jülich Gmbh, Jülich, DE;
Abstract
The invention relates to a measuring apparatus for detecting weak electromagnetic signals from a sample at low frequencies, specifically in the frequency range of 1 kHz-10 MHz, in particular, and to a measuring method. The problem addressed by the invention is that of providing an apparatus which can be used to detect weak electromagnetic signals from a sample, in particular in the frequency range of 1 kHz-40 MHz, with a good signal-to-noise ratio. For the solution, the measuring apparatus comprises an electromagnetic resonant circuit having a pick-up coil of low quality, a preferably tunable capacitance and a filter coil; the filter coil and the capacitance have a high quality of at least 100, advantageously at least 200, particularly preferably at least 500. Alternatively or additionally, the quality of the resonant circuit is at least 100, advantageously at least 200, particularly preferably at least 500. The quality of the filter coil and the quality of the capacitance exceed the quality of the pick-up coil, specifically at least by twice the amount. The measurement signal is then available at the two ends of the filter coil with a good signal-to-noise ratio.