title: An improved method for detecting passive pills.
abstract: One of the principal disadvantages of the passive pill as a telemetric method for measuring various physiological parameters has been its resticted range. The reasons for the restricted range with existing detection methods are discussed. An improved method using a locking spectrometer based on third-order phase-sensitive detection is described and its performance is assessed. A significant increase in the usable range of a high sensitivity passive pill is obtained.
mesh_terms: D008839:Microelectrodes; D055585:Physical Phenomena; D010825:Physics; D013686:Telemetry / Q000379:methods*