A system for determining a velocity of air flowing in an air flow direction through an opening. The system includes first and second transducer assemblies with first and second transducers. The first and second transducers are positioned in respective predetermined first and second positions in which the first and second transducers are intervisible. The first and second transducers are disposed at respective selected tilt angles when in the respective predetermined first and second positions. Each of the first and second transducer assemblies includes means for measuring respective measured tilt angles of the first and second transducers. The system also includes a controller configured to compare the measured tilt angles to the selected tilt angles for the first and second transducers respectively, to determine whether there are measured differences therebetween exceeding a predetermined permitted difference. The controller generates a dislocation signal if the measured difference exceeds the permitted difference.

A method determines the time required for a timed up and go test and for verifying an ascertained result. A distance measuring device is provided which continuously measures the distance from a subject located in front of a chair to the backrest of the chair and which forwards the distance to a control unit. The chair is positioned in particular at a specified distance to a wall, an obstacle, or a marking. The measured distance values recorded by the distance measuring device are continuously recorded. The subject is instructed to stand up from the chair, walk forwards, in particular towards the wall, the obstacle, or the marking, and then turn around, in particular in front of the wall, the obstacle, or in the region of the marking, and sit back down on the chair. The subject carries out these instructions to the best of their ability.

A method determines the time required for a timed up and go test and for verifying an ascertained result. A distance measuring device is provided which continuously measures the distance from a subject located in front of a chair to the backrest of the chair and which forwards the distance to a control unit. The chair is positioned in particular at a specified distance to a wall, an obstacle, or a marking. The measured distance values recorded by the distance measuring device are continuously recorded. The subject is instructed to stand up from the chair, walk forwards, in particular towards the wall, the obstacle, or the marking, and then turn around, in particular in front of the wall, the obstacle, or in the region of the marking, and sit back down on the chair. The subject carries out these instructions to the best of their ability.

A first arithmetic circuit computes a propagation velocity of an ultrasonic wave based on a first time difference between an output timing, at which an ultrasonic element outputs an ultrasonic wave, and a reference timing, at which a comparator circuit outputs a detection signal on reflection off a distal end of a reference pipe, and a length of the reference pipe. A period circuit sets a propagation path detection period to detect a liquid level timing, at which the comparator circuit outputs the detection signal on reflection off the liquid level, based on a longest and shortest propagation path lengths and the propagation velocity. A second arithmetic circuit computes the length of the propagation path based on a second time difference, which is between the liquid level timing and the output timing during the propagation path detection period, and the propagation velocity.

A first arithmetic circuit computes a propagation velocity of an ultrasonic wave based on a first time difference between an output timing, at which an ultrasonic element outputs an ultrasonic wave, and a reference timing, at which a comparator circuit outputs a detection signal on reflection off a distal end of a reference pipe, and a length of the reference pipe. A period circuit sets a propagation path detection period to detect a liquid level timing, at which the comparator circuit outputs the detection signal on reflection off the liquid level, based on a longest and shortest propagation path lengths and the propagation velocity. A second arithmetic circuit computes the length of the propagation path based on a second time difference, which is between the liquid level timing and the output timing during the propagation path detection period, and the propagation velocity.

An electronic system includes: a fastening portion of a joint-wearable device, the fastening portion configured to physically secure the joint-wearable device for affixing the joint-wearable device relative to a physiological joint of a user; and a joint sensor of the joint-wearable device, the joint sensor connected to the fastening portion and configured to generate a sensor output for representing a joint movement associated with the physiological joint in controlling the electronic system according to the joint movement.

A method and apparatus for identifying shim geometries. A first part and a second part are assembled with a couplant positioned between the first part and the second part at a shim location, at which a shim is to be installed, to form an assembly. A pulse of ultrasonic energy is sent into the assembly at each of a set of selected locations along the assembly corresponding to the shim location using an ultrasonic device. A plurality of echoes is detected for each of the set of selected locations using data generated by the ultrasonic device in response to the ultrasonic device receiving reflections of the ultrasonic energy. A geometry for the shim is identified based on the plurality of echoes detected at each selected location of the set of selected locations.

A method and apparatus for identifying shim geometries. A first part and a second part are assembled with a couplant positioned between the first part and the second part at a shim location, at which a shim is to be installed, to form an assembly. A pulse of ultrasonic energy is sent into the assembly at each of a set of selected locations along the assembly corresponding to the shim location using an ultrasonic device. A plurality of echoes is detected for each of the set of selected locations using data generated by the ultrasonic device in response to the ultrasonic device receiving reflections of the ultrasonic energy. A geometry for the shim is identified based on the plurality of echoes detected at each selected location of the set of selected locations.

Embodiments can provide a medical imaging patient bed with an integrated electronic ruler system, comprising a light strip, mounted to the medical imaging bed; a trough comprising an open end and a closed end, mounted to the medical imaging bed and oriented such that the light strip is bounded by the open end and the closed end of the trough; a laser distance meter attached to the open end of the trough; a microcontroller; and a power source configured to provide power to the light strip, laser distance meter, and microcontroller; wherein the microcontroller is configured to illuminate the light strip after one or more distance measurements are received from the laser distance meter when an object is inserted into the trough; wherein a position of the illumination of the light strip corresponds to the one or more distance measurements received from the laser distance meter.

Embodiments can provide a medical imaging patient bed with an integrated electronic ruler system, comprising a light strip, mounted to the medical imaging bed; a trough comprising an open end and a closed end, mounted to the medical imaging bed and oriented such that the light strip is bounded by the open end and the closed end of the trough; a laser distance meter attached to the open end of the trough; a microcontroller; and a power source configured to provide power to the light strip, laser distance meter, and microcontroller; wherein the microcontroller is configured to illuminate the light strip after one or more distance measurements are received from the laser distance meter when an object is inserted into the trough; wherein a position of the illumination of the light strip corresponds to the one or more distance measurements received from the laser distance meter.