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Product Name: LTP-V Long Trace Profilometer
Product Description
The LTP-V Long Trace Profilometer is an interferometric optical profiling
instrument for absolute figure measurement of flats, spheres and aspheres up to
1500 mm in diameter. The LTP-V characterizes the figure and mid-frequency errors
on cylindrical aspheres over 1 meter in length, and excels at measuring the
shape of exotic aspheric optics, adaptive optics and miror-bending mechanisms.
Using the LTP-V , optical surfaces can be measured quickly, easily and with
nanometer precision and accuracy -- without the need for null corrector lenses
or external reference surfaces. It is the only instrument now available for
absolute figure measurement of optics as large as 150 cm in diameter.
Absolute Accuracy
What sets the LTP-V apart from all other profile-measuring instruments, is its
ability to correct for real-time probe-beam angular errors during the traverse
of the linear beam without the need for a calibrated external reference
standard. Variations in the probe-beam pointing direction are measured and
subtracted from the test surface slope, resulting in the absolute slope profile
and measurement of the absolute radius of curvature of the test surface.
About the LTP-V
Conceived at Brookhaven National Laboratory and commercialized by Continental
Optical in the early 1990s, the Long Trace Profilometer has been completely
redesigned since our acquisition of Continental Optical in 2000. The LTP-V is a
slope-measurement interferometer that measures the phase difference between two
co-linear probe beams as they move across the sample surface. It is extremely
insensitive to vibrations, which makes the LTP-V suitable for use in laboratory
environments.
Slope Measurement
The LTP-IV belongs to the class of "slope-measuring" interferometer rather than
"height-measuring" interferometer. It measures the phase difference between two
collinear probe beams as they move across the surface. It is extremely
insensitive to vibrations, which makes it suitable for use in normal laboratory
or optical shop environments. The patented optical system used in the LTP-IV is
an equal-path interferometer, which further removes it from environmental
influences.
Maximum Radius of Curvature
The total slope change over the length of the LTP's mirror is 20 mrad (0.2
radian) angular. The formula that relates radius, length and angular range is:
total slope = L/Rmin (where L is in meters)
The minimum radius given by the LTP is Rmin = L/0.02 = 50 L. For
a 100-mm long mirror the minimum radius is 5 meters. This specification is for
the tangential radius (in the direction of the scan). The surface can be highly
curved in the sagittal direction with a radius as small as a few mm.
Pricing
A great deal of care and consultation is required before the purchase of an LTP-V.
The cost for the LTP-V includes these consultations, shipping of the instrument,
installation of the instrument, and training in its operation. The LTP-VMIR is
an additional attachment for taking vertical and inverted mirror scans. The
LTP-CALSTD is a calibrated standard mirror for use as a reference source.
|
Item Code |
Price |
|
LTP-V: |
$120000 |
|
LTP-VMIR: |
$1500 |
|
LTP-CALSTD: |
$1000 |
Specifications
| Scan Length: |
1500 mm |
| Scan Velocity: |
3 mm/second
(assuming 1-mm steps, 1 sample) |
|
Position Accuracy: |
+/- 0.5 µm |
|
Slope Accuracy: |
<1 microradian |
| Height Accuracy: |
<50 nm; 10-nm
variations have been measured |
| Slope
Measurement Range: |
+/- 5.0
milliradian |
Company Details
Ocean Optics is a leading supplier of solutions for optical sensing – fundamental methods of measuring and interpreting the interaction of light with matter. We enable diverse applications in medical and biological research, environmental... more
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