Flow Velocity Detector in a Microchip Based on a Photothermally Induced Grating

DOI PDF Web Site Web Site Web Site 1 Citations 20 References
  • KATAYAMA Kenji
    Department of Applied Chemistry, Faculty of Science and Technology, Chuo University
  • KIKUTANI Yoshikuni
    Micro Chemistry Group, Kanagawa Academy of Science and Technology
  • KITAMORI Takehiko
    Micro Chemistry Group, Kanagawa Academy of Science and Technology Department of Engineering, The University of Tokyo

Search this article

Abstract

A new photothermal technique was developed for measuring the flow velocity and making solute concentration measurements in a microchip by using the same optical and instrumental setup. Collinear pump and probe light were irradiated onto a microchip surface on which a grating pattern was fabricated. The pump light induced a temperature change with the grating pattern in a microchannel, and a refractive index change due to a subsequent temperature rise was monitored by a heterodyned diffraction signal of the probe light. The flow velocity and concentration were obtained by monitoring the motion and intensity change of the thermally induced grating, respectively. The dynamic range of the flow velocity measurement was 0.17 - 670 mm/s, which is sufficient for covering most chemical applications of a microchip. The detection limit of the concentration measurement was 2 × 10-6 M for a rhodamine B solution.

Journal

  • Analytical Sciences

    Analytical Sciences 23 (6), 639-643, 2007

    The Japan Society for Analytical Chemistry

Citations (1)*help

See more

References(20)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top