Target System

Abstract

A target system for a weapon effect simulation system. The target system includes a retro-reflecting prism having at least three back surfaces arranged to an incident simulation beam. At least one of the back surfaces includes a first, selectively reflecting layer arranged to reflect a simulation beam of a predetermined optical wavelength range and being substantially transparent to optical wavelengths outside the range. A second layer is arranged on the first layer. The second layer is arranged to receive beams transmitted through the first layer. The second layer includes a material having an index of refraction sufficiently high to avoid total internal reflection between the first and second layer within a predetermined range of incident angles.

1 . A target system for a weapon effect simulation system, said target system comprising: 
 a retro-reflecting prism having at least three back surfaces arranged to retro-reflect an incident simulation beam and wherein at least one of the back surfaces comprises a first, selectively reflecting layer arranged to reflect a simulation beam of a predetermined optical wavelength range and being substantially transparent to optical wavelengths outside said range, wherein a second layer is mounted on the first layer, said second layer being arranged to receive beams transmitted through said first layer and said second layer being of a material having an index of refraction sufficiently high to avoid total internal reflection between said first and second layer within a predetermined range of incident angles.    
   
   
       2 . The target system according to  claim 1 , wherein the second layer is arranged to absorb at least parts of the transmitted beam.  
   
   
       3 . The target system according to  claim 1 , wherein the second layer is arranged to diffuse reflect at least parts of the transmitted beam.  
   
   
       4 . The target system according to  claim 1 , wherein the second layer comprises an IR high-pass filter.  
   
   
       5 . The target system according to  claim 1 , wherein the second layer comprises an IR band-pass filter.  
   
   
       6 . The target system according to  claim 1 , wherein the index of refraction of the second layer is substantially equal to the index of refraction of the first layer.  
   
   
       7 . The target system according to  claim 1 , wherein the first layer comprises a multi-layer dielectric coating.  
   
   
       8 . The target system according to  claim 1 , further comprising: 
 an adhesive layer is interposed between the first and second layer.    
   
   
       9 . The target system according to  claim 8 , wherein the index of refraction of the adhesive layer is substantially equal to the index of refraction of the first layer.  
   
   
       10 . The target system according to  claim 1 , further comprising: 
 a third, wavelength selective reflective layer is mounted on top of the second layer.    
   
   
       11 . A retro-reflecting prism, comprising: 
 at least three back surfaces arranged so as to retro-reflect an incident optical beam and wherein at least one of the back surfaces comprises a first, selectively reflecting layer arranged to reflect an optical beam of a predetermined optical wavelength range and being substantially transparent to optical wavelengths outside said range, wherein a second layer is arranged on the first layer, said second layer being arranged to receive optical beams transmitted through said first layer and said second layer being of a material having an index of refraction sufficiently high to avoid total internal reflection between said first and second layer within a predetermined range of incident angles.