Abstract: Various embodiments include a hazard detector comprising: a microphone configured to record an audio signal; a hazard sensor; a detection circuit connected to the hazard sensor; and a processing unit connected to the detection circuit and the microphone. The detection circuit receives signals from the hazard sensor and generates a signal as a function thereof. The processing unit comprises a digital interface for communication with an external computer and is configured: to receive the detector signal from the detection circuit; to receive the audio signal from the microphone and to detect a predetermined preamble comprising a word in the audio signal; and if the detector signal contains a positive indication with respect to a hazard or if a predetermined preamble is detected in the audio signal, to generate a output signal as a function of the received signal and send the output signal to the computer via the interface.

Abstract: Device for determining the mixing ratio of a mixture of at least two different fluids, the device comprising: a pipe section with a measuring region; wherein the mixture flows through the measuring region; a radar sensor system with a radar sensor chip arranged on an outer wall of the pipe section. The radar sensor system is configured to: irradiate frequency-modulated millimeter-radar waves (fS) in a specified frequency range (?f) into the measuring region; receive millimeter-radar waves (fR) backscattered by the mixture; determine a frequency-dependent reflection coefficient (?f) for the specified frequency range (?f) using the backscattered millimeter-radar waves (fR); and calculate or allocate the mixing ratio from the determined frequency-dependent reflection coefficient (?f).

Abstract: Various embodiments include a hazard detector comprising: a microphone configured to record an audio signal; a hazard sensor; a detection circuit connected to the hazard sensor; and a processing unit connected to the detection circuit and the microphone. The detection circuit receives signals from the hazard sensor and generates a signal as a function thereof. The processing unit comprises a digital interface for communication with an external computer and is configured: to receive the detector signal from the detection circuit; to receive the audio signal from the microphone and to detect a predetermined preamble comprising a word in the audio signal; and if the detector signal contains a positive indication with respect to a hazard or if a predetermined preamble is detected in the audio signal, to generate a output signal as a function of the received signal and send the output signal to the computer via the interface.