Abstract: A device for determining the physiological condition of a person in a simple manner, which device measures the pulse rate and based on that additionally determines the heart rate variability. In addition, at least one parameter should be used for the history of one of the two above-mentioned values. The deviation of the pulse rate and the heart rate variability from a normal variable is preferably integrated and used as an additional indicator. The device preferably includes a wearable electrocardiography device.

Abstract: The invention relates to a device for determining the current stress state of a person in a simple manner, which device measures the pulse rate and based on that additionally determines the heart rate variability. In addition, at least one parameter should be used for the history of one of the two above-mentioned values. The deviation of the pulse rate and the heart rate variability from a normal variable is preferably integrated and used as an additional stress indicator. The device preferably includes a wearable electrocardiography device.

Abstract: For easy determination of the current stress condition of a person, a device is proposed that detects the pulse rate and therefrom additionally determines the heart rate variability. In addition, at least one parameter related to the history of one of the two above mentioned values shall be used. Preferably, the deviation of the cardiac frequency and of the heart rate variability from a reference value is integrated and used as an additional stress indicator.

Abstract: For easy determination of the current stress condition of a person, a device is proposed that detects the pulse rate and therefrom additionally determines the heart rate variability—preferably by means of a fast Fourier transform. In addition, at least one parameter related to the history of one of the two values mentioned above shall be used. Preferably, the deviations of the cardiac frequency and of the heart rate variability from corresponding norm parameters are integrated and thus used as an additional stress indicator.

Abstract: A spectral measuring system for determining substance properties using terahertz radiation comprises: one or more radiation sources of which at least one radiation source is adjustable or configurable with regard to its wavelength, wherein the first radiation source emits first radiation at a predetermined first wavelength; and is characterised by a sensor which responds to further radiation which is based on the radiation of the at least one radiation source; a control unit which is connected to the at least one radiation source and the sensor; wherein the control unit is configured to trigger at least one radiation source and to adjust the wavelength of the at least one adjustable radiation source as well as to read out the sensor.

Abstract: The present invention relates to a device for accomplishing noise reduction in a photoacoustic gas detector using a sound damping element and/or a background or reference microphone where a preferably larger external volume that acts as a sound damping element (SDE) is coupled to a smaller volume through which the gas diffuses. The coupling is accomplished in such a way that the externally generated sound waves incident upon the photoacoustic detector are adequately attenuated by the larger volume SDE without adversely affecting diffusion of the gaseous species of interest through the smaller volume for measurement by the detector. Preferably this is accomplished by coupling the larger SDE volume to the smaller gas diffusion volume by a long and thin pressure channel.

Abstract: An indoor air quality sensor designed to be utilized in a zone of a building to control the ventilation of the zone and the method of effecting such control. The sensor comprises a first sensor for sensing a selected leading indicator of contamination in the zone and providing an output signal representative thereof and at least one additional sensor for sensing at least one selected secondary indicator of contamination in the zone and providing an output signal representative thereof. A processor, utilized for generating an output signal representative of the indoor air quality in the zone, receives the output signals from the first sensor and the least one additional sensor and generates the output signal representative of the indoor air quality in the zone by influencing the output of the first sensor by an amount that is a function of the output signal of the least one additional sensor.