Modulator monitoring during measuring electromobility

摘要

An apparatus for measuring information indicative of electromobility in a sample includes a light source for generating coherent light, a modulator that modulates the optical path length, particularly a reciprocatable modulator arranged for modulating a first part of the generated light, a sample cell for accommodating the measured sample for applying an electric field to the sample and for receiving a second part of the generated light for interaction with the sample in the electric field, a modulator monitor for monitoring the modulator by detecting interference between a first part of the light coming from the modulator and an unmodulated third part of the generated light, and a light detector arranged separately from the modulator monitor for detecting interference between a second part of light coming from the modulator and light received from the sample cell. The detected signal includes the information indicative of electromobility in the sample.

主权项

1. An apparatus for measuring information which is indicative of electromobility in a sample, the apparatus comprising:
a light source configured for generating coherent light; a modulator arranged for modulating a first part of the generated light; a sample cell for accommodating the measured sample, configured for applying an electric field to the sample, and arranged for receiving a second part of the generated light for interaction with the sample in the electric field; a modulator monitor configured for monitoring the modulator by detecting interference between a first part of the light coming from the modulator and an unmodulated third part of the generated light; a light detector arranged separately from the modulator monitor and being configured for detecting interference between a second part of light coming from the modulator and light received from the sample cell, wherein the detected signal includes the information which is indicative of electromobility in the sample.