Abstract: A measurement system for measuring the CO2 concentration in an environmental chamber or in an incubator has a radiation source with an optical axis and at least two radiation detectors. The radiation source and the radiation detectors are arranged such with respect to one another that the radiation emitted by the radiation source impinges, after passing through a measurement volume, on the radiation detectors. In each case one channel having a first end and a second end is provided for each radiation detector. The radiation detector is arranged at the first end and the first end of the channel is remote from the radiation source. The channels have a diameter which is smaller than the diameter of the measurement volume, transverse to the optical axis.

Abstract: The invention relates to an infrared gas sensor for determining the concentration of a measuring gas that absorbs infrared radiation, comprising a sensor housing containing two infrared radiation detectors adjacently situated on one end of a measurement beam path, and on the other end containing a measurement radiation source that emits infrared radiation. According to the invention, a measuring chamber accessible to the measuring gas is situated in the measurement beam path between the measurement radiation source and the detectors, at a distance from the detectors and sealed essentially gastight with respect to the remainder of the measurement beam path by at least one infrared-transmitting window.

Abstract: The invention relates to a measuring device (10) for determining the concentration of gases by infrared absorption, comprising a radiation source (2) which is arranged, together with a radiation detector (6) disposed in the radiation path, inside a housing (11) which is sealed in a gas-tight manner in relation to the gas which is to be measured. At least one infrared permeable window is arranged in the radiation path between the radiation source (2) and the radiation detector (6). Said window seals the inside of the housing in relation to the gas which is to be measured. The radiation path is divided into at least three sections (21, 22, 23).

Abstract: A radiating apparatus, particularly an infrared radiating apparatus, having at least one radiation source which has a configuration which is broad in the direction transverse to the emission direction of interest. In order to construct a radiating apparatus which persists over a relatively long period of time in being resistant to temperature changes and which has relatively low thermal inertia, a carbon strip is provided as a radiation source. The strip includes a plurality of segments which are joined together, the ends of which segments are mounted in support members, wherewith at least the first and last of said support members are in the form of respective contacts.