Range testing system having simulated optical targets

A test unit for a laser range finder responding to a single input energy pulse in a first path and applying delayed energy pulses to a second path comprising:

• input optical means responsive to the single input energy pulse in said first path;
• an optical fiber line responsive to the energy pulse from said input optical means for delaying said input energy pulse a selected time period, said optical fiber line being comprised of a plurality of sequential sections including a first section, each section having ends, with said first section having a first end positioned to receive at least a portion of said energy pulse from said input optical means;
• energy tapping means coupled between the corresponding ends of sequential sections with a predetermined control gap between the ends of each section to pass tapped samples of said energy pulse from said fiber line, said energy tapping means including a plurality of tapping structures mounted on a first side of a flat plate and a plurality of lenses on the other side of said plate positioned to each receive the tapped energy pulse from a different one of said tapping structures, each tapping structure comprising an elongated glass structure having a central axis and an opening therethrough, the sections of said optical fiber positioned in the opening in said glass structure with ends spaced apart to provide a control gap to sample said energy pulse, and a flat mirrored surface at an output end of said tapping structure positioned at an angle relative to said central axis to reflect said tapped energy pulse to a corresponding one of said lenses;
• and
• superposition optical means responsive to the delayed energy pulses to apply said delayed energy pulses to said second path.

A range test device for a range finder having a transmission path and a reception path and displaying a signal received in said reception path comprising:

• a fiber optic line having an input section with an input end and an output end and a selected number of sequential other sections each having input and an output end,
• input optical means coupled between the transmission path and the input end of said input section,
• multiple sampling means having a plurality of sampling structures, each coupling the input section and the other sections such that the output end of one section is coupled to the input end of another sequential section, each sampling structure having means to provide a gap between the coupled ends to controllably transfer a sampled signal to a common optical path, and
• output optical means positioned to receive the sampled signals from said common optical path and pass said sampled signals to said reception path.