Method and apparatus for determining a substance using THz radiation

摘要

The invention relates to a method for determining a liquid in a closed container using THz radiation, in which a first and a second measurement are carried out, wherein the THz radiation is emitted in the direction of the liquid for measuring properties of the liquid, and a portion of the THz radiation coming from the direction of the liquid is detected. In the proposed method, the closed container contains, in addition to the liquid, a gas, wherein a wall of the container is transmissive for THz radiation and wherein the detected portion of the THz radiation in the first measurement is reflected at a boundary surface between the wall and the gas or a pocket containing the gas, and the second measurement is reflected at a boundary surface between the wall and the liquid. The first measurement thus serves as a reference measurement for capturing disturbing losses in the THz beam path and for determining influences of the wall on a measurement result for the second measurement. The invention further relates to an arrangement suitable for carrying out this method.

主权项

1. A method for determining a substance amid the application of THz radiation, with which a first and a second measurement are carried out, wherein the THz radiation is emitted in the direction of the substance for measuring characteristics of the substance, and a share of the THz radiation coming from the direction of the substance is detected,
wherein the substance is a liquid and is located in a closed container which additionally contains a gas, wherein a wall of the container is transparent to THz radiation, wherein the THz radiation with the first measurement is directed onto a location of the wall, at which the gas or a bubble containing the gas contacts the wall, and the detected share of the THz radiation with the first measurement is reflected at a boundary surface between the wall and the gas or the bubble, whereas the THz radiation with the second measurement is directed onto a location of the wall, at which the liquid contacts the wall, and the detected share of the THz radiation with the second measurement is reflected at a boundary surface between the wall and the liquid, and wherein the first measurement serves as a reference measurement for a measurement result of the second measurement.