| Sensitivity
Characteristics |
| Sensitivity characteristics
easily applicable in wavelength bands used by optical
disks |
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Conventional
optical power meters, that use a silicone sensor, have
characteristics that are dependent on the wavelength in
all measurement regions. For this reason, the light
emission wavelength must be known beforehand to ensure
accurate measurement. The TB200, however, has been
designed so that its sensitivity characteristics are
flat near the blue (405nm), red (660nm) and near
infrared (785nm) wavelength bands, which are used by
various optical disks. As a result, the TB200 can
measure with little error independently of light
emission wavelength.
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Stable
Measurement
Stable measurement independent of distance from
lens |
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As conventional
optical power meters do not perform processing to
prevent reflection on the sensor surface, multiple
reflection occurs between the sensor surface of the
optical power meter and the lens holder, for example, of
the optical pickup that emits the laser. As a result,
correct measurement is not possible at some distances
from the lens. The TB200, however, performs
anti-reflection processing to prevent the influence of
multiple reflection.
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Photo-receiving
Sensor
Large 18mm dia. photo-receiving sensor ideal for
picking up high NA light
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Surface Sensitivity
Relative surface
sensitivity distribution
±
2mm area from center: approx. 99.5%
± 5mm area from center: approx. 99% |
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With high NA (numerical aperture) lenses,
the sensor must be brought close to the
laser emitter to ensure accurate measurement
as these lenses have a large angle of
incidence. As the maximum angle of incidence
of lenses having 0.85NA is about 60 degrees.
The light receiving area is 10mm in diameter
at a distance of 3mm from the focal point.
The
light receiving diameter of the TB200's
sensor head is 18mm (effective diameter:
14mm or more). This means that stable
measurement can be obtained using light
emitted from high NA lenses even the sensor
is not accurately positioned. |
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| Sensor Head Designed
for Use in Production Lines |
| When the Optical Power Meter
is used in production lines, the sensor is sometimes
attached to manufacturing equipment or jigs. The TB200
has been designed so that the thin optical sensor module
can be easily detached from the sensor head.
Note: Product quality is
assured when the optical power meter is shipped from the
factory with its sensor mounted in its case. If
the user removes the sensor from its case for use, the
quality warranty will be voided.
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| Full Remote Control
Enabled on the USB Interface |
| The capability for fast and
full remote control is required on automated production
lines. All TB200 functions can be fully
remote-controlled at high speed on its USB interface.
Measurement results can also be sent to a PC over the
USB interface.
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| Block Diagram (TB200
with protector attached) |
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