An environmental parameter sensor for a mobile device is described comprising a first acoustic transducer; a second acoustic transducer arranged at a predetermined distance from the first acoustic transducer; a controller coupled to the first acoustic transducer and the second acoustic transducer; wherein the controller is configured to determine at least one of a time-of-flight value and an attenuation value of an acoustic signal between the first acoustic transducer and the second acoustic transducer and to determine at least one environmental parameter from the at least one of the time-of-flight value and the attenuation value The environmental parameter sensor may determine environmental parameters such as temperature, wind speed, and humidity from acoustic measurements.

A gas concentration determination system includes an acoustic sensor generating acoustic sensor data and a humidity sensor generating relative humidity data. A modified relative humidity is determined based at least in part on the acoustic sensor data and the relative humidity data. A gas concentration is determined using the modified relative humidity and the acoustic data. Using the modified relative humidity instead of the relative humidity data may reduce false positives in detecting gas leaks in HVAC systems, for example.

The invention relates generally to an Internet of Things (IoT) enabled wireless sensor system using attached and/or embedded passive electromagnetic sensors (PES) with distribution hardware. One embodiment of this invention includes a wireless sensor system, which permits process control and predictive maintenance on a utility's electrical transmission and distribution grid. Another embodiment includes a wireless sensor system, which permits process control and predictive maintenance of liquid or gas through a pipeline. Another embodiment includes a wireless sensor system, which permits measurement of breathable air pollutants. Furthermore, a method of manufacturing a protective passive electromagnetic sensor pod and passive electromagnetic sensor equipped distribution hardware components is provided.

The invention relates generally to an Internet of Things (IoT) enabled wireless sensor system using attached and/or embedded passive electromagnetic sensors (PES) with distribution hardware. One embodiment of this invention includes a wireless sensor system, which permits process control and predictive maintenance on a utility's electrical transmission and distribution grid. Another embodiment includes a wireless sensor system, which permits process control and predictive maintenance of liquid or gas through a pipeline. Another embodiment includes a wireless sensor system, which permits measurement of breathable air pollutants. Furthermore, a method of manufacturing a protective passive electromagnetic sensor pod and passive electromagnetic sensor equipped distribution hardware components is provided.

An aerosol-generating device for generating aerosol from an aerosol-generating article is provided, the aerosol-generating device including: at least one sensor configured to determine a humidity of the aerosol-generating article; and a controller configured to control at least one function of a plurality of control functions of the aerosol-generating device based on the humidity of the aerosol-generating article determined by the at least one sensor, the at least one sensor including at least one acoustic sensor. An aerosol-generating system including the aerosol-generating device the aerosol-generating article is also provided. A method of operating an aerosol-generating system is also provided.