THORLABS vytran PTR308 User Manual page 6

PTR308 Automatic Recoater with Linear Proof Tester
Chapter 3 Description
Introduction
The PTR308 is an automatic optical fiber recoater with a built-in linear proof tester. Once the fiber is placed in the
fiber holding blocks, all recoating and proof testing functions are performed automatically.
This recoater has two quartz mold plates that, when closed together, form a circular mold cavity around the section
of fiber to be recoated. The mold plates are opened and closed using a pneumatically actuated gripper assembly,
which requires a compressed air or gas supply of 80 to 120 psi (not included). Once the mold is closed, a volumetric
dispensing pump injects a pre-programmed amount of liquid recoat material directly into the mold cavity. The
material is then cured by exposure to ultraviolet (UV) light, provided by UV LEDs. The end result is a flexible UV
acrylate coating that closely resembles the original fiber in both appearance and performance.
To ensure the reliability of the recoated section of fiber, it is necessary to perform a proof test after the recoat
process. This is because the recoat, just like the original coating, is intended only to provide protection to the glass,
not strength. With the PTR308, the same fiber holding blocks that are used to hold the fiber for recoating are also
used to perform the proof test. The right-hand block moves linearly to apply a pre-programmed load to the fiber, up
to a maximum of 20 Newtons (235 kpsi for a 125 micron diameter fiber). Rubber inserts within the holding blocks
tightly grip the fiber without damaging the original coating. A vacuum connection is provided on the back of the unit
to assist in loading the fiber holding blocks, but this is typically not required as fiber guides make loading the fiber
without vacuum quite easy.
Parts Checklist
When unpacking the PTR308 for the first time, check to be sure that you have the following:

PTR308 Proof Tester / Recoater

Power Supply

AC power cord

Handset controller

Fittings kit

Canvas bag containing:
Wye cable
o
1/8" O.D. pressure supply tubing
o
Small bottle with cap
o
UV curable acrylate (purchased separately)
o
Cotton swabs
o
Lens tissue
o
Top inserts (purchased separately)
o
Bottom inserts (purchased separately)
o
3/32" hex key
o
0.035" hex key
o

External vacuum pump with vacuum line (optional; purchased separately)
If you are missing any of the above or need replacements, please contact Thorlabs.
Page 4
Chapter 3: Description
TTN123729-D02