Atr probe

An ATR probe for registering an optical property of a medium, comprising:

• a monolithic ATR body, which has at least one surface section contactable with the medium;
• a sending light conductor arrangement for sending non-collimated light into the ATR body;
• a receiving light conductor arrangement for receiving sent light after passage through said ATR body, wherein:
• the passage of light through said ATR body includes at least two total reflections on said media-contacting surface of the ATR body;
• the effective area of said receiving light conductor arrangement, for receiving light emerging from said ATR body, is a factor F greater than the effective area of said sending light conductor arrangement for sending light into said ATR body, wherein F amounts to at least 1, preferably at least 4/3 and further preferably at least 3/2 and especially preferably at least 2;
• and
• said sending light conductor arrangement includes at least two sending light conductors and said receiving light conductor arrangement at least three receiving light conductors.