In one embodiment, a method includes determining, by a controller, a first wind direction relative to a first vehicle and determining, by the controller, a first wind speed relative to the first vehicle. The method also includes calculating, by the controller, an absolute wind direction relative to ground using the first wind direction relative to the first vehicle and calculating, by the controller, an absolute wind speed relative to the ground using the first wind speed relative to the first vehicle. The method further includes calculating, by the controller, a second wind direction relative to a second vehicle using the absolute wind direction and calculating, by the controller, a second wind speed relative to the second vehicle using the absolute wind speed. A front end of the first vehicle and a front end of the second vehicle face different directions.

Methods and apparatuses for indicating the presence of a threshold directional differential pressure between separated adjacent spaces. A conduit contains a movable element that indicates whether the pressure difference between the two spaces is at least as high as a threshold pressure difference. The apparatus is adjustable to have different threshold set points by adjusting the pivot arm inclination. The device may include at least two pivot axes. A rotating base may rotate relative to the barrier or wall, and a pivot arm may be attached and rotate relative to the rotating base. With the rotating base set at a first rotation angle, the pivot arm may be adjustable within a single plane. When the rotating base is set at a second rotation angle, the pivot arm may be adjustable within a different single plane. The device may include a single pivot axis where a pivot arm is parallel to the wall and rotates about a horizontal axis perpendicular to the wall.

A plumbing fixture assembly including a fluid flow detection system for monitoring fluid flow and flow characteristics through plumbing fixtures without contacting the fluid. The fluid flow detection system communicates collected data related to the plumbing fixtures to a water management system, which analyzes the data and provides information to a user through a portal and user interface. The fluid flow detection system also tracks users of the plumbing fixtures for compliance with a hand washing routine. The hand washing compliance data is communicated to the water management system as well.

The present disclosure describes various systems and methods for measuring environmental parameters. In one embodiment, such as system comprises a pole that is equipped with various instruments (sensors) at various heights along the length of the pole. With such an instrumented pole, a local vertical profile of parameters that relate to wind conditions and air quality can be obtained. These parameters can include one or more of wind speed and direction, air turbulence, air temperature and humidity, concentrations of pollutant gases within the air, and concentrations of pollutant particles within the air. In some embodiments, the system can further measure other parameters that are relevant to the migration of the air and, therefore, the pollutants it contains.

A measurement method for visualizing the flow of a fluid that includes: a preparation process where a photochromic compound, whose amount of absorption of light changes upon irradiation with transformation-inducing light, is dissolved in the fluid; a transformation-inducing irradiation process where the fluid is irradiated with transformation-inducing light that causes photochromism; and a post-transformation imaging process where an image of the fluid is taken after irradiation by the transformation-inducing light. During the post-transformation imaging process, a first image is generated by taking an image of the fluid by using first light in the first wavelength range in which the amount of absorption of light changes upon irradiation with transformation-inducing light.

Methods and apparatuses for indicating the presence of a threshold directional differential pressure between separated adjacent spaces. A conduit contains a movable element that indicates whether the pressure difference between the two spaces is at least as high as a threshold pressure difference. The apparatus is adjustable to have different threshold set points by adjusting the pivot arm inclination. The device may include at least two pivot axes. A rotating base may rotate relative to the barrier or wall, and a pivot arm may be attached and rotate relative to the rotating base. With the rotating base set at a first rotation angle, the pivot arm may be adjustable within a single plane. When the rotating base is set at a second rotation angle, the pivot arm may be adjustable within a different single plane. The device may include a single pivot axis where a pivot arm is parallel to the wall and rotates about a horizontal axis perpendicular to the wall.

An apparatus and method for use in determining one or more fluid flow properties of a fluid in a conduit is disclosed. The apparatus includes a substrate including a barrier, a first flow sensor coupled to the substrate and a second flow sensor coupled to the substrate. The first flow sensor is located at a first sensor distance from a first barrier surface, and the second flow sensor is located a second sensor distance from the second barrier surface. The first sensor distance is substantially equal to the second sensor distance. In operation, the first flow sensor produces a first sensor signal, and the second flow sensor produces a second sensor signal. The direction of flow for the fluid is determined by comparing the first sensor signal to the second sensor signal.

A wind detection device with a flexible enclosure, and opening, and a dispensing tube, filled with powder or liquid and designed to be attached to hunting equipment, headgear, or clothing, wherein pressing on the outside of the device causes a puff of powder or vapor to be dispensed into the air, allowing the user to determine wind direction.

A fire detection and suppression system correcting fire detection based on wind. Wind may affect both the apparent position of the fire detected by the fire detectors and also the suppressant jet being delivered by a monitor. Typically wind results in shifting of estimated fire location away from the real fire in the direction of wind. Similarly the suppressant jet will also be diverted in the same direction. The system comprises fire detectors for acquiring two-dimensional fire location information for a fire. A wind sensor acquires wind information, often in region of the fire. A system controller then compensates the three-dimensional fire location information based on the wind information. Additionally, the position of fog/jet monitors is preferably compensated based on the wind information. The jet pressure setting is also ideally determined based on the wind.

A device measures a flight parameter of an aircraft which has a radome. Systems measure the deformation of a wall of the radome due to forces exerted by the air on the radome. A computer computes the flight parameter from deformation measurements obtained by the systems. The systems have an optical fiber carried by the radome provided with Bragg gratings. Each fiber has a plurality of Bragg gratings distributed over a length of the fiber so as to distribute the Bragg gratings over the radome when the fiber is installed.