Abstract: A magnetohydrodynamic sensor system for testing or arming high speed projectiles by providing a high speed signal at the time of projectile exit from a firearm. The sensor unit generally includes a magnet, a first electrode, and a second electrode spaced apart from the first electrode. The first electrode and the second electrode detect an induced voltage caused by a conductive gas passing through a properly oriented magnetic field as the gas exits the barrel with a projectile. The sensor unit may be mounted on the barrel of a firearm, etc., may be mounted on the projectile, and/or motor of the projectile (e.g. rocket). When mounted on a projectile, the sensor unit or onboard electrical circuitry are preferably located at the rear end of the projectile to allow activation of the onboard electrical circuitry and/or sensor unit when substantially the entire projectile exits the barrel for added safety.

Abstract: A closed-loop pressure washing system including a pressure washer device for pressure washing an object having a contaminant, and for recovering the contaminant. The pressure washing system includes a supporting mechanism arranged to support the object while a washing fluid is flowed over the object to remove the contaminant. A collection arrangement is included at least partially located below the supporting mechanism. The collection arrangement is further arranged to receive raw run-off fluid from the support mechanism. A flush assembly is arranged to at least periodically impinge rinsing fluid onto the supporting mechanism to hydro-dynamically sweep contaminants collecting on the support mechanism into the collection arrangement.