A capacitive sensor for non-contact nanoliter droplet detection

Sensors and Actuators, A: Physical

Volumn 153, Issue 1, 2009, Pages 57-63

  Ernst, A ^a   Streule, W ^a   Schmitt, N ^a   Zengerle, R ^a   Koltay, P ^a  

^a UNIVERSITY OF FREIBURG   (Germany)

Author keywords

Capacitive sensor; Nanoliter dispensing; Non contact detection; Process control

Indexed keywords

CAPACITIVE SENSOR; COST-EFFICIENT; DIELECTRIC CONSTANTS; DROPLET VOLUME; HIGH PRECISION; LIQUID DROPLETS; LIQUID VOLUME; LOW COSTS; MICRO DROPLETS; MICRO-DISPENSING; NANOLITER; NANOLITER DISPENSING; NANOLITERS; NON-CONTACT; NON-CONTACT DETECTION; NON-CONTACT MONITORING; ONLINE MONITORING; PEAK VALUES; SENSOR SIGNALS; SENSOR UNITS; SIGNAL CHANGES; SINGLE DROPLET;

DROP FORMATION; ELECTRIC FIELDS; LIQUIDS; PRINTED CIRCUIT BOARDS; PRINTED CIRCUIT MANUFACTURE; SENSORS; SIGNAL DETECTION;

PROCESS CONTROL;

EID: 67349094521     PISSN: 09244247     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.sna.2009.04.023     Document Type: Article

References (21)

1. J. Comley, Continued miniaturisation of assay technologies drives market for nanolitre dispensing, Drug Discovery World Summer 2004, 2004, pp. 1-8.
2. Le H.P. Progress and trends in ink-jet printing technology. J. Imaging Sci. Technol. 42 (1998) 49-62
3. Cooley P., et al. Applications of ink-jet printing technology to BioMEMS and Microfluidic systems. SPIE Conference on Microfluidics and BioMEMS (2001)
4. Lee E.R. Microdrop Generation (2002), CRC Press. 0-8493-1559-X
5. Winn W.P. An electrostatic theory for instruments which measure the radii of water drops by detecting a change in capacity due to the presence of a drop. J. Appl. Meteorol. 7 5 (1968) 929-937
6. H.W. Meinhold, Sensor for detecting droplet characteristics, US Patent (US 6,764,168 B1), 2004.
7. Heerens W.Chr. Basic principles in designing highly reliable multiterminal capacitor sensors and performance of some laboratory test models. Sens. Actuator 3 (1982/83) 137-148
8. Puers R. Capacitive sensors: when and how to use them. Sens. Actuator A 37-38 (1993) 93-105
9. Eric Weisstein's "World of Physics", http://scienceworld.wolfram.com/physics/Capacitance.html (June '08).
10. Auge J., Dierks K., Prange S., and Henning B. Monitoring of droplet growth with nano-litre resolution for liquid flow rates, level or surface measurement. Sens. Actuator A 110 (2004) 18-27
11. Streule W., et al. PipeJet: a simple disposable dispenser for the nanoliter- and microliter range. JALA 9 5 (2004) 300-306
12. M.D. Vahey, J. Voldman, in: J. Voldman (Ed.), An Equilibrium Method for Continuous-Flow Cell Sorting Using Dielectrophoresis, Anal. Chem. 80 (2008) 3135-3143.
13. BioFludix GmbH Georges-Koehler-Allee 106 79110 Freiburg, http://www.Biofluidix.de.
14. J. Franz, Methods to measure small capacitances with high resolution, TM-Technisches Messen 67, 4 (2000), Oldenburg Verlag.
15. R.J. Widlar, IC Op Amp Beats FETs on Input Current, National Semiconductor, Application Note 29, September, 2002.
16. Marioli D., et al. Measurement of small capacitance variations. IEEE Trans. Instrum. Meas. 40 2 (1991)
17. Heerens W.Chr., and Vermeulen F.C. Capacitance of Kelvin guard-ring capacitors with modified edge geometry. J. Appl. Phys. 46 6. (1975)
18. Baxter L.K. Capacitive Sensors-Design and Applications (1997), John Wiley & Sons
19. VISIT GmbH & Co.KG, Postfach 6628 D-97016 Würzburg, http://www.visit-gmbh.de.
20. Chr. Berg, et al., Grundlagen der Wägetechnik, Sartorius AG 1995, 2, Auflage 1996.
21. Spiegel M.R., Schiller J., and Alu Srinivasan R. Schaum's Outline-Probability and Statistics. 2nd ed. (2000), McGraw-Hill Companies Inc.