P4.4 - Investigations on Noise Level in AC- and DC-Bridge Circuits for Sensor Measurement Systems
- 18. GMA/ITG-Fachtagung Sensoren und Messsysteme 2016
2016-05-10 - 2016-05-11
- P4 Funk-basierte Sensoren, Messung elektrischer Größen
- M. Khan, G. Dumstorff, C. Winkelmann, W. Lang - Universität Bremen, Bremen (Germany)
- 601 - 605
Reducing noise in measurement is an important challenge in resistive sensing. This paper presents a system based on AC-excitation and lock-in amplification. In order to evaluate the circuit ability to perform precise measurement, noise level in AC- and DC-excitation is measured. Experimental results show a promising read-out system that is capable of high noise level reduction in noisy environments. Using AC bridge excitation and lock-in amplification, the noise level is reduced by 1:55 compared with DC-excitation.