9670B Series

Description

The image dissector is a variant of a photomultiplier with a small active diameter that can be magnetically positioned (or scanned) over a large photosensitive diameter. Its fast response time makes it the detector of choice when rapid movements in an object imaged onto the photosensitive diameter are to be monitored.

The 9670B has a 0.5 mm active diameter that can be positioned (or scanned) over an 15 mm  photosensitive diameter. 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 Diameter.

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.

• 9670B Series Data Sheet

Features and Characteristics

Applications

• 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)

Accessories