Abstract: A method of determining the condition of a metal powder for use in an additive manufacturing process, involving processing an image of the powder to measure a surface property of the powder, such as colour, texture or particle shape. The proportion of powder whose measured surface property falls outside a pre-determined range is determined and can be used to decide whether or not the powder is suitable for re-use. The proportion is determined by identifying individual particles in the image which are identified as statistical outliers amongst all of the particles shown in the image when considering a measured surface property. The relevant proportion may be determined statistically.

Abstract: A method of determining the condition of a metal powder for use in an additive manufacturing process, involving processing an image of the powder to measure a surface property of the powder, such as colour, texture or particle shape. The proportion of powder whose measured surface property falls outside a pre-determined range is determined and can be used to decide whether or not the powder is suitable for re-use. The proportion is determined by identifying individual particles in the image which are identified as statistical outliers amongst all of the particles shown in the image when considering a measured surface property. The relevant proportion may be determined statistically.

Abstract: A magnetic sensor assembly measures changes in the position of a lever arm. The magnetic sensor assembly has a support. A lever arm can pivot about an axis of rotation or a pivot point and is attached to the support at a first end of the lever arm. A magnet produces a magnetic field adjacent the first end of the lever arm and is fixed to rotate in a predetermined arc about the pivot point or axis of rotation in response to a pivotal movement of the lever arm. A magnetic sensor is positioned in proximity to the magnet to detect changes in the magnetic field due to rotation of the magnet along a predetermined arc. Preferably the predetermined arc has a constant radius of curvature forming at least a portion of a circular arc. The magnetic sensor assembly preferably employs a magnet that is at least arcuate in shape more preferably the magnet is annular or penannular forming a ring.

Abstract: A float sensor that is modular has a mounting bracket which incorporates an O-ring seal and bayonet style resilient mounting fingers which lock the mounting bracket to a tank flange. A tube is ultrasonically welded to the mounting bracket and positions a reed switch housing which is ultrasonically welded to the end of the tube opposite the mounting bracket. The reed switch housing incorporates a stop positioned above a descending cone. The cone terminates in radially outwardly extending fingers that lock a float to the reed switch housing. The float is free to float upwardly along the cone to engage the stop. The float has a ring shaped magnet foamed in place within a low density plastic body. The presence of fluid buoys the float upwardly until the float engages the stop.

Abstract: A battery powered radio transmitter of a cross-sectional diameter substantially equal to the cross-sectional diameter of an arrow shaft is positioned in series between the head and nock of a metallic hunting arrow. The transmitter section of the shaft is light in weight so as not to affect the normal flight characteristics of the arrow. The shaft portion between the transmitter and the nock acts as the antenna for the transmitter. A switch is provided for operation of the transmitter. A portable directional radio receiver of the same frequency as the transmitter is utilized by the hunter to track the spent arrow.