The invention relates to a measurement device 1 comprising a rotatable magnetic object 4 which can oscillate with a resonant frequency if excited by an external magnetic torque. The measurement device 1 is adapted such that the resonant frequency depends on the temperature or on another physical or chemical quantity like pressure, in order to allow for a wireless temperature measurement or measurement of the other physical or chemical quantity via an external magnetic field providing the external magnetic torque. This measurement device can be relatively small, can be read-out over a relatively larger distance and allows for a very accurate measurement.

The invention relates to a measurement device 1 comprising a rotatable magnetic object 4 which can oscillate with a resonant frequency if excited by an external magnetic torque. The measurement device 1 is adapted such that the resonant frequency depends on the temperature or on another physical or chemical quantity like pressure, in order to allow for a wireless temperature measurement or measurement of the other physical or chemical quantity via an external magnetic field providing the external magnetic torque. This measurement device can be relatively small, can be read-out over a relatively larger distance and allows for a very accurate measurement.

A stretchable sensor is provided. The stretchable sensor includes a first stretchable electrode including a first elastomer and a first conductor dispersed in the first elastomer, a stretchable active layer formed on the first stretchable electrode and including a third elastomer and an ion conductor dispersed in the third elastomer, and a second stretchable electrode formed on the stretchable active layer and including a second elastomer and a second conductor dispersed in the second elastomer. The stretchable sensor is effectively capable of sensing a temperature without being affected by strain and recognizing strain without being affected by temperature.

A stretchable sensor is provided. The stretchable sensor includes a first stretchable electrode including a first elastomer and a first conductor dispersed in the first elastomer, a stretchable active layer formed on the first stretchable electrode and including a third elastomer and an ion conductor dispersed in the third elastomer, and a second stretchable electrode formed on the stretchable active layer and including a second elastomer and a second conductor dispersed in the second elastomer. The stretchable sensor is effectively capable of sensing a temperature without being affected by strain and recognizing strain without being affected by temperature.

A sensor system. The sensory system includes a substrate extending in a substrate plane, a closed cavity and a movable structure in the closed cavity, at least one portion of the movable structure being situated at a distance opposite a surface of the substrate extending in parallel to the main extension plane within the cavity, the distance varying when the movable structure is deflected, a temperature difference between the surface of the substrate and the movable structure being measurable by an action of force on the movable structure.

A sensor system. The sensory system includes a substrate extending in a substrate plane, a closed cavity and a movable structure in the closed cavity, at least one portion of the movable structure being situated at a distance opposite a surface of the substrate extending in parallel to the main extension plane within the cavity, the distance varying when the movable structure is deflected, a temperature difference between the surface of the substrate and the movable structure being measurable by an action of force on the movable structure.

Aspects of the present disclosure describe Rayleigh-based DTSS that utilizes few-mode fiber (FMF), which supports multiple spatial modes. For each spatial mode, a wavelength-scanning configuration gives the relative wavelength (or frequency) shift between two consecutive measurements. The temperature and strain changes can therefore be separated through different temperature/strain sensitivities of various mode-pairs. Advantageously, Rayleigh-based DTSS according to aspects of the present disclosure removes temperature-strain ambiguity, enhances measurement accuracy, reduces errors. and enables new features for multi-parameter sensing.

A tracking system for tracking a marker device for being attached to a medical device is provided, whereby the marker device includes a sensing unit comprising a magnetic object which may be excited by an external magnetic or electromagnetic excitation field into a mechanical oscillation of the magnetic object, and the tracking system comprises a field generator for generating a predetermined magnetic or electromagnetic excitation field for inducing mechanical oscillations of the magnetic object, a transducer for transducing a magnetic or electromagnetic field generated by the induced mechanical oscillations of the magnetic object into one or more electrical response signals, and a position determination unit for determining the position of the marker device on the basis of the one or more electrical response signals.

A tracking system for tracking a marker device for being attached to a medical device is provided, whereby the marker device includes a sensing unit comprising a magnetic object which may be excited by an external magnetic or electromagnetic excitation field into a mechanical oscillation of the magnetic object, and the tracking system comprises a field generator for generating a predetermined magnetic or electromagnetic excitation field for inducing mechanical oscillations of the magnetic object, a transducer for transducing a magnetic or electromagnetic field generated by the induced mechanical oscillations of the magnetic object into one or more electrical response signals, and a position determination unit for determining the position of the marker device on the basis of the one or more electrical response signals.

The application describes embodiments including, e.g., a measurement device comprising: a casing, a first magnet arranged within the casing such that it is rotatable out of an equilibrium orientation responsive to an external magnetic torque acting on the first magnet, a second magnet to provide a restoring torque to force the first magnet back into the equilibrium orientation responsive to an external magnetic torque rotating the first magnet out of the equilibrium orientation, allowing for a rotational oscillation of the first magnet, which is excited by the external magnetic torque, with a resonant frequency, and a temperature sensitive magnetic material to modify the resonant frequency.