Improved frequency/voltage converters for fast quartz crystal microbalance applications - Sorbonne Université Access content directly
Journal Articles Review of Scientific Instruments Year : 2008

Improved frequency/voltage converters for fast quartz crystal microbalance applications

Abstract

The monitoring of frequency changes in fast quartz crystal microbalance (QCM) applications is a real challenge in today’s instrumentation. In these applications, such as ac electrogravimetry, small frequency shifts, in the order of tens of hertz, around the resonance of the sensor can occur up to a frequency modulation of 1kHz ⁠. These frequency changes have to be monitored very accurately both in magnitude and phase. Phase-locked loop techniques can be used for obtaining a high performance frequency/voltage converter which can provide reliable measurements. Sensitivity higher than 10mV∕Hz ⁠, for a frequency shift resolution of 0.1Hz ⁠, with very low distortion in tracking both the magnitude and phase of the frequency variations around the resonance frequency of the sensor are required specifications. Moreover, the resonance frequency can vary in a broad frequency range from 5to10MHz in typical QCM sensors, which introduces an additional difficulty. A new frequency-voltage conversion system based on a double tuning analog-digital phase-locked loop is proposed. The reported electronic characterization and experimental results obtained with conducting polymers prove its reliability for ac-electrogravimetry measurements and, in general, for fast QCM applications.

Dates and versions

hal-04137746 , version 1 (22-06-2023)

Identifiers

Cite

R. Torres, J. García, A. Arnau, Hubert Perrot, L. To Thi Kim, et al.. Improved frequency/voltage converters for fast quartz crystal microbalance applications. Review of Scientific Instruments, 2008, 79 (4), pp.045113. ⟨10.1063/1.2908430⟩. ⟨hal-04137746⟩
5 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More