This
is a brief letter to thank you for utilizing our detectors
and to inform you of significant recent advancements in our current
line of detectors.
Applied Detector Corporation was founded by
Louis Wang on April 1, 1970 in Belmont, California. In 1973, the
company moved to Fresno, California. The application of the same Ge
detector was also switched from the wide-range X-ray and Gamma-ray to
the near -IR and visible light detection. With the help of Dr. Ken
Zimmermann of the North Coast Optical & Sensor Inc.,
thousands of detectors were sold in the world during the last 30 years.
In
2006, a major improvement was made. The original stainless steel dewar
was replaced by the aluminum dewar made by the Kadel Corporation with
the same stainless steel front end. A longer neck tube was used
to allow the space for the preamplifier. (see the top photo of
four dewar configurations)
A small improvement in gain and
speed product was made by reducing stray feedback capacitance. Another
major innovation is the internally generated HV bias. It increases
stability by eliminating the feed-through detector leakage problem
during wet weather. A small price PS 2 is now available with Lemo cable
to form a complete package. A black Delrin cap is also supplied with a
smoke detector gamma source of less than one micro-curie. By cooling
for ~45 minutes, our customer can immediately test the new detector
with only an oscilloscope to visually see the gamma ray response, rise
and fall time and pulse shape.
In the detector page, we present
the spectrum comparison with InGaAs detector, visible PMT and
Hamamatzu's NIR PMT. We welcome the contribution of Dr. Bilski on the
test of new High Speed model. He told me the “L” sensitive model had
a small improvement. Dr. Galloway had accepted a recently made “S”
detector with a time constant of 20 micro-seconds. We can supply any
time constant between the HS and L model as before, such as 50 to 150
micro-second for Raman spectrometer.
I would be very happy to receive any feedback. Please FAX to me at 559-441-0258.
