Is there any way to add multiple topurg rangers to a robot in ros stage?

edit

Yes, but I'm not sure why you'd need to... This would be configured in the .world file.

define hokuyolaser ranger
(
  sensor(       
    range [ 0.0  5.0 ]
    fov 270
   samples 270
  )

  # generic model properties
  color "blue"
  size [ 0.07 0.07 0.05 ] # dimensions from LMS200 data sheet 
)

define hokuyorapid ranger
(
  sensor(       
    range [ 0.0  4.0 ]
    fov 240
   samples 240
  )

  color "blue"
  size [ 0.073 0.060 0.055 ]
)

pioneer3dx
(         
  # can refer to the robot by this name
  name "pioneer"
  pose [92 46 0 0] 

  hokuyorapid(color "blue")
  hokuyolaser(color "red")
)

This is an example. I didn't add the pose variable in the configuration, so they would be on top of one another if input as such. Put them at different positions.

Update: Stage will not allow for a single robot to have multiple rangefinders... But, you could use sonar in addition to a laser rangefinder (I know this for a fact - I did this all the time when I was using player... Ah, back in the day.)