A piece of 1-mm thickness optical glass was mounted at the bottom of the reservoir; photons produced during the Ru[(bpy).sub.3.sup.2+] ECL reaction passed through the glass window and were detected by a photomultiplier tube
The elements constituting the reader used in the chemiluminescent assays were as follows: two lasers for reaction mixture illumination; an illumination chamber; optical train with collimating lenses, filter wheel, and shutter; photomultiplier tube
(PMT); controlling computer; and software.
The BlankCell procedure serves to calibrate the chemiluminescence signal received by the photomultiplier tube
to a solution of known concentration.
The heart of the unit is a photomultiplier tube
descended from the light-sensitive devices pioneered by Jakob Kunz and Joel Stebbins early in this century (S&T: May 1992, page 496).
The light drives the photoelectric effect in a photomultiplier tube
that produces a measurable pulse proportional to the energy of the incident gamma-ray photon.
Using readings from a sensitive light detector called a photomultiplier tube
, they offer the first evidence of a biological version of the phenomenon known as sonoluminescence.
So now, you're dealing with the problem of getting your signal above the noise level of the photomultiplier tube
(PMT), which is notoriously inefficient.
Beth models are equipped with three detectors including a photomultiplier tube
for the UV-Vis region, and InGaAs and PbS detectors for the NIR region.
The R7639 photomultiplier tube
(PMT) features high Quantum Efficiency (QE) and high sensitivity.
Czerepinski notes, "that along with being designed for simultaneous acquisition of Cy3 and Cy5 the device features real-time control of a photomultiplier tube
(PMT), allowing users to rapidly maximize the array signal achieved while avoiding signal saturation."
31 Physical Review Letters, the duo described using a sensitive photomultiplier tube
and lenses to collect light from a metal sample as it was scanned with the STM tip.