AUTODYNE TRANSDUCERS OF SIGNALS OF NUCLEAR MAGNETIC RESONANCE,
Abstract
An analysis is presented of the stabilizing action of active negative feedback on autodyne pickups for the investigation of solids by the NMR method. In such applications, autodyne pickups have certain advantages over others, but must be stabilized when the signal voltage is low, such as is the case with solid-state NMR. The transients in an autodyne pickup with stabilized amplitude are calculated, and the modifications that must be introduced in the pickup circuit to ensure stability are described. Empirical means of selecting the autodyne circuit and its parts to obtain maximum sensitivity are suggested, since a theoretical analysis of this problem is impossible. A schematic diagram of a pickup with stable operation at less than 0.005 volt on the resonant circuit is presented. This circuit has been thoroughly tested and proved itself in practical investigations of several natural compounds by the NMR method. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 18, 1967
- Accession Number
- AD0660410
Entities
People
- A. R. Mkrtchyan
- L. L. Dekabrun
- Ya. N. Kilyanov
Organizations
- National Air and Space Intelligence Center