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High speed multi-frequency impedance analysis of single particles in a microfluidic cytometer using maximum length sequences

Sun, Tao, Holmes, David, Gawad, Shady, Green, Nicolas G and Morgan, Hywel (2007) High speed multi-frequency impedance analysis of single particles in a microfluidic cytometer using maximum length sequences Lab on a Chip, 7 (doi:10.1039/B703546B).

Record type: Article


A novel impedance spectroscopy technique has been developed for high speed single biological particle analysis. A microfluidic cytometer is used to measure the impedance of single micrometre sized latex particles at high speed across a range of frequencies. The setup uses a technique based on maximum length sequence (MLS) analysis, where the time-dependent response of the system is measured in the time domain and transformed into the impulse response using fast M-sequence transform (FMT). Finally fast Fourier transform (FFT) is applied to the impulse response to give the transfer-function of the system in the frequency domain. It is demonstrated that the MLS technique can give multi-frequency (broad-band) measurement in a short time period (ms). The impedance spectra of polystyrene micro-beads are measured at 512 evenly distributed frequencies over a range from 976.5625 Hz to 500 kHz. The spectral information for each bead is obtained in approximately 1 ms. Good agreement is shown between the MLS data and both circuit simulations and conventional AC single frequency measurements.

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Published date: 2007
Organisations: Electronics & Computer Science


Local EPrints ID: 264155
ISSN: 1473-0197
PURE UUID: 4a78b6ab-dc29-43c7-81a3-a0496a393eac
ORCID for Nicolas G Green: ORCID iD
ORCID for Hywel Morgan: ORCID iD

Catalogue record

Date deposited: 11 Jun 2007
Last modified: 18 Jul 2017 07:39

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Author: Tao Sun
Author: David Holmes
Author: Shady Gawad
Author: Nicolas G Green ORCID iD
Author: Hywel Morgan ORCID iD

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