Cooling device

摘要

A cooling device (1) is specified for cooling a detector element (3) disposed in the jacket cavity (4) of a Dewar vessel (4) by means of a Joule-Thomson cooler (2) with an expansion nozzle (15) that opens into an expansion chamber (16), wherein the cooling device comprises a final control element (22) that is adjustable depending on the temperature for influencing the flow through the expansion nozzle (15). It is provided here that a first temperature sensor (34) is disposed in the expansion chamber (16) and a second temperature sensor (35) is disposed within the Dewar vessel (4) outside the expansion chamber (16), and that the cooling device comprises a control device (40) that is configured for detecting a temperature gradient from the sensor values of the first temperature sensor (34) and of the second temperature sensor (35) and for adjusting the final control element (22) depending on the detected temperature gradient.