Automatic frequency control for solid-state sources in electron spin resonance

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143595· OSTI ID:7289061

Pechan, M J; Xu, J; Johnson, L D ^[1]

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1. Department of Physics, Miami University, Oxford, Ohio 45056 (United States)

A lock-in amplifier circuit has been designed and tested which serves as an automatic frequency control (AFC) for electron spin resonance (ESR) spectrometers employing solid-state microwave generators. Its implementation in a typical spectrometer is described and a detailed electronic schematic presented. Its performance is tested as a lock-in amplifier operating under open loop conditions, wherein operating with a 20-kHz reference, it yields an 81-dB improvement in signal to (9 kHz) noise ratio. This is consistent with expectations from computer simulations. When employed as an AFC in a typical X-band ESR system the capture and lock ranges are observed to be equivalent to those obtained from a commercial lock-in amplifier.

• DOE Contract Number: FG02-86ER45281
• OSTI ID: 7289061
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:7; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
AMPLIFIERS
CONTROL
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EPR SPECTROMETERS
EQUIPMENT
FREQUENCY CONTROL
KLYSTRONS
LOCK-IN AMPLIFIERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
OPERATION
SIGNAL-TO-NOISE RATIO
SPECTROMETERS
TUNING