phototube

One major application of the phototube was the reading of optical sound tracks for projected films.

In these, a mechanical switch or a phototube turned an electromagnet on for a brief section of the pendulum's swing.

A photomultiplier is a phototube whose sensitivity is greatly increased through the use of electron multiplication.

A phototube or photelectric cell is a type of gas-filled or vacuum tube that is sensitive to light.

A phototube provides a voltage measurement which permits the calculation of the quantized action (Planck constant) of light.

For example, the yield of a phototube is measured in phe/keVee (photoelectrons per keV electron-equivalent energy).

Note that the phosphorimager data have units related to the voltage of its phototube, which are not related in any obvious way to nucleic acid concentrations or amounts.

His experiment directly measured potentials, not electron kinetic energy: he found the electron energy by relating it to the maximum stopping potential (voltage) in a phototube.

The XRT assembly was a single thin NaI(Tl) scintillation crystal plus phototube enclosed in a howitzer-shaped CsI(Tl) anti-coincidence shield.

S. E. Harris and A. E. Siegman, "A proposed FM phototube for demodulating microwave- frequency-modulated Light signals," IRE Trans.

For example, an increase in frequency results in an increase in the maximum kinetic energy calculated for an electron upon liberation - ultraviolet radiation would require a higher applied stopping potential to stop current in a phototube than blue light.

Focal plane instruments: Optec SSP-5A single channel photoelectric photometer, (containing a Hamamatsu R1414 phototube), standard 1 mm diaphragm, Johnson UBV filters, motorized filter slider, 80386 PC based data acquisition.