9670B - 29mm Photomultiplier Tube
ADIT Electron Tubes
The image dissector is a variant of a photomultiplier with a small active area that can be magnetically positioned (or scanned) over a large photosensitive area. Its fast response time makes it the detector of choice when rapid movements in an object imaged onto the photosensitive area are to be monitored.
The 9670B has a 0.5 mm active diameter that can be positioned (or scanned) over an 15 mm diameter photosensitive area. The photocathode is an S20 type with low resistivity suited to monitoring images projected from, or back-lit by, visible light.
Photoelectrons from the photocathode enter a drift tube which has a fixed exit aperture, and only those passing through the aperture are amplified by the internal electron multiplier. The size of the exit aperture defines the size of the active area.
When a transverse magnetic field is applied in the cathode to first dynode region, photoelectrons from a different part of the photocathode pass through the exit aperture. The active diameter can be magnetically positioned or scanned as required to monitor changes in an image projected onto the photocathode.
The electron multiplier has 9 BeCu dynodes of linear focused design for fast response time. The size of the output signal can be adjusted by varying the applied HV.
- PMT Type: PMT (photomutiplier tube)
- Wavelength Of Max Response: 350 nm
- Wavelength Range: 280 - 900 nm
- Rise Time: 5 ns
- Monitoring of movements in images projected onto the photocathode (e.g. rotation of rotor blade)
- Monitoring of changes in the edge of an object projected onto the photocathode (e.g. wheel or axle wobble under rotation or stress)
- Voltage dividers available
- Magnetic Shields available
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