A simple method for measuring the Q value of an NMR sample coil.
نویسنده
چکیده
A simple method for measuring the Q (quality factor) value of an NMR sample coil based on an impedance matching principle is described. This method has the advantage of utilizing a signal generator and reflection coefficient bridge rather than an expensive high-frequency Q meter and offers an alternative means of measuring the Q value of an NMR sample coil or any other radio frequency coil.
منابع مشابه
Design Modification of Rogowski Coil for Current Measurement in Low Frequency
The principle object of this paper is to offer a modified design of Rogowski coil based on its frequency response. The improvement of the integrator circuit for nullifying the phase difference between the waveforms of the measured-current and the corresponding terminal voltage is a further object of this investigation. This paper addresses an accurate, yet more efficient measuring and protect...
متن کاملMagnetic Resonance Techniques
First the main characteristics of the NMR magnetic measurements, such as accuracy, independence of field direction and zero temperature coefficient are recalled. Then some different magnetic field measuring techniques using NMR, and the conditions to achieve such measurements, are described. Finally, recent NMR applications, used in various domains such as MRI and accelerator-magnet alignment, ...
متن کاملMeasuring the Quadriceps Angle by a New Method and Comparison with Goniometer and Radiography
Objective: The purpose of this study is to decrease the amount of error when measuring Q–angles using a goniometer by the new method, a private system developed at the I.R;#39s university of social welfare & rehabilitation sciences (USWR) by Investigator. Materials & Methods: Fourty subjects with Eighty healthy knees participated in this methodologic study. One investigator participated in d...
متن کاملDesigning and Fabrication of a New Radiofrequency Planar microcoil for mini-Nuclear Magnetic Resonance
Introduction Radiofrequency planar microcoils are used to increase the resolution of magnetic resonance images of small samples. In this study, we aimed to design and fabricate a spiral planar microcoil constructed on a double-sided printed circuit board (PCB). It has four rings with an internal diameter of 241 microns tuned and matched at 63.8 MHz. Materials and Methods To achieve the maximum ...
متن کاملNMR Diffusion Diffraction and Diffusion Interference from Cells
Pulsed field gradient spin-echo (PGSE) NMR spectroscopy is the definitive means for measuring translational motion of molecules in free solution and in heterogeneous systems. A unique ‘twist’ on the method is that in some systems in which diffusion is restricted the PGSE experiment yields information on the geometrical properties of the confining boundaries. When applied to red blood cells (RBC...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of magnetic resonance
دوره 142 2 شماره
صفحات -
تاریخ انتشار 2000