Directed energy deposition spray nozzle distribution pattern testing

A method of collecting particles from a stream of sprayed particles, the method comprising:

• positioning a spray nozzle over a collection apparatus at a first distance, wherein the collection apparatus comprises:
• a plurality of coaxial collection tubes extending substantially parallel to a major axis, wherein each tube of the plurality of coaxial collection tubes comprises:
• a first end defining an orifice, wherein the first end is disposed at a first position on a plane substantially orthogonal to the major axis,
• a second end coupled to an end of a respective outlet tube of a plurality of outlet tubes, the respective outlet tube comprising an outlet tube wall,
• a collection tube wall extending from the first end to the second end, wherein the collection tube wall at the first end comprises a first diameter, wherein the collection tube wall at a second position between the first end and the second end comprises a second diameter greater than the first diameter, wherein the collection tube wall extending from the second position to the first position tapers toward the major axis at a first angle,
• wherein a first coaxial collection tube of the plurality of coaxial collection tubes is disposed radially inward from a second coaxial collection tube of the plurality of coaxial collection tubes,
• wherein a first outlet tube wall of the plurality of outlet tubes extends through a second outlet tube wall of the plurality of outlet tubes, and
• wherein a shape of the first outlet tube wall is configured to reduce accumulation of particles on the outer surface of the first outlet tube wall;
• and
• collecting particles sprayed from the spray nozzle with the collection apparatus.