Abstract: Aspects of the disclosure are directed to a bolt comprising: a body having a head, a circumferential sidewall, a central bore extending at least a portion of a length of the bolt, and a plurality of slots extending through the sidewall from the bore, a plurality of positioning arms at least partially located within an interior of the bolt, and a screw seated within the head, where a position of the screw within the head controls an extent to which the plurality of the positioning arms are extended through the sidewall.

Abstract: Aspects of the disclosure are directed to a bolt comprising: a body having a head, a circumferential sidewall, a central bore extending at least a portion of a length of the bolt, and a plurality of slots extending through the sidewall from the bore, a plurality of positioning arms at least partially located within an interior of the bolt, and a screw seated within the head, where a position of the screw within the head controls an extent to which the plurality of the positioning arms are extended through the sidewall.

Abstract: An optical probe includes a first end, a second end, an outer housing, an inner housing concentric with the outer housing, flow holes within the inner housing at the first end, and an optics holder within the inner housing between the flow holes and the second end. The optical probe further includes high temperature optical lenses inside the optics holder between the flow holes and the second end, fiber holders inside the optics holder between the high temperature optical lenses and the second end, optical fibers coated in a high temperature material extending from inside fiber holders towards the second end, and a high temperature adhesive for securing the optical fibers, the fiber holders, and the high temperature optical lenses.

Abstract: An optical probe includes a first end, a second end, an outer housing, an inner housing concentric with the outer housing, flow holes within the inner housing at the first end, and an optics holder within the inner housing between the flow holes and the second end. The optical probe further includes high temperature optical lenses inside the optics holder between the flow holes and the second end, fiber holders inside the optics holder between the high temperature optical lenses and the second end, optical fibers coated in a high temperature material extending from inside fiber holders towards the second end, and a high temperature adhesive for securing the optical fibers, the fiber holders, and the high temperature optical lenses.