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PFCU NIM Control Module
 

Models PFCU/PF4/PFS2

Filter/Shutter Inserter
with NIM Control Module


PF4/PF2S2 Filter/Shutter Module Datasheet

(Updated August 14, 2003 - 167 KB, PDF)
PF4/PF2S2 User's Manual
(NEW May 2004, 199 KB, PDF)
PF4/PF2S2 Installation Drawing
(31 KB, PDF)
PF4/PF2S2 Barrel Mating Drawing
(13 KB, PDF)


PFCU NIM Control Module Datasheet
(114 KB, PDF)
PFCU User's Manual
For current NIM modules with the BLACK front panel as pictured on this page.
(NEW August 2005, 50 KB, PDF)
PFCU NIM Control Module Datasheet
(114 KB, PDF)

The Model PF4 is designed to reproducibly attenuate an x-ray beam by inserting up to four filter foils under remote manual or computer control. In the Model PF2S2, thick absorber blades replace two filters to form a focal plane shutter.

The PFCU-4 is a flexible control unit for both Model PF4 Filter Inserters and Model PF2S2 Filter/Shutter Units. In a 1-wide NIM module, it implements both manual control, via front panel switches, and remote control, via either TTL I/O or RS-232 daisy chain.

 


PF2S2 shown with foil carrier

PF4/PF2S2 Description

The Model PF4 is designed to reproducibly attenuate an x-ray beam by inserting up to four filter foils under re-mote manual or computer control. The foils are moved by miniature pneumatic actuators controlled by electri-cally operated valves. Each foil is mounted on its own carrier (see photo), which is held in place by a single snap ring. Foils are thus easy to change without removing the instrument body from the beampath. As a result of careful design the entire instrument is very compact.
In the Model PF2S2, thick absorber blades replace two filters to form a focal plane shutter. This gives a more uniform spatial exposure than does a single bladed shutter which opens and closes. Minimum exposure times of less than 0.1 sec are not difficult to produce.

Both PF4 and PF2S2 mate with Blake Industries' line of beampath components and can operate evacuated or He filled, as the actuator shafts are O-ring sealed. Either model can be retrofitted as the other.

Features

  • PF4: 4 filters, 2 cm square aperture
  • PF2S2: 2 filters and 2 shutters,
  • aperture 2 cm wide by 8 mm high
  • Pneumatically actuated
  • Low power electrically controlled
  • Easy filter changes

Applications

Detector linearization and protection
The Model PF4 is particularly useful for synchrotron radiation experiments where a detected x-ray intensity may vary over several orders of magnitude. The experi-ment is then optimized for acceptable counting rates with weak signals and filters are inserted to retain detector linearity in the presence of strong signals. Examples include surface reflection studies, diffraction from both normal and "forbidden" peaks, Huang scattering near diffraction peaks, etc. Using the PF4, these experiments can be completely automated.

Count rate normalization
In routine data collections for many samples, the PF4 can conveniently match the detector's linear range to sample scattering strengths even if they do not vary widely during the experiment. This allows the spectro-meter to be "tuned" to the sample in a standardized and reliable manner.

Calibrated attenuations
The ease of changing filters encourages the creation of standard, calibrated filter sets on their own foil carriers for common operations at different energies. This re-sults in reliable and reproducible attenuation ratios from experiment to experiment. (Order PF-4FC foil carriers.)

Exposure control
With a properly graded filter set, the PF4 also provides a simple way to adjust "exposure" in experiments requir-ing a particular x-ray dose (eg. topography photographs). This capability is further enhanced by the Model PF2S2, which allows timed x-ray exposures as well.

Beam shutter implementation

The PF2S2 (or the PF4 with a heavy absorber replac-ing one foil) is a convenient way to minimize damage to radiation sensitive samples by restricting exposure to only those times when data is actually being collected. In laboratory systems this is also an easy way to implement a stopper for safety reasons too.

Specifications

  • Physical dimensions
    SIZE: 100 mm in line, 62 mm wide, 200 mm high.
    X-RAY BEAM APERTURE
    PF4: 20 mm high by 20 mm wide.
    PF2S2: 8 mm high by 20 mm wide.
  • Foil carriers
    FEATURES: Single snap ring mounted & easy to change. Accepts foils up to 3 mm thick.
    NUMBER SUPPLIED: 4
  • Foils (User Supplied)
    NOMINAL SIZE: 1" (25 mm) square
  • Shutter Blades
    MATERIAL: Stainless steel, 0.125" thick. Blades in other materials are easily user fabricated.
    NUMBER SUPPLIED: 2 with PF2S2.
  • Pneumatic
    CONNECTION: 6 mm or 1/4" dia tubing.
    SUPPLY: 50 to 100 psi (3.5 to 7.0 bar) compressed air, 5 mm filtered, unlubricated.
  • Electrical
    SUPPLY: 24 V DC, 23 mA per valve.
    CONNECTOR: Subminiature 9 pin male D Plug Mates to 9 pin female D Receptacle.

PF4/PF2S2 Filter/Shutter Module Datasheet
(Updated August 14, 2003 - 167 KB, PDF)
PF4/PF2S2 User's Manual
(NEW May 2004, 199 KB, PDF)
PF4/PF2S2 Installation Drawing
(31 KB, PDF)
PF4/PF2S2 Barrel Mating Drawing
(13 KB, PDF)

PFCU-4 Description

The PFCU-4 is a flexible control unit for both Model PF4 Filter Inserters and Model PF2S2 Filter/Shutter Units. In a 1-wide NIM module, it implements both manual control, via front panel switches, and remote control, via either TTL I/O or RS-232 daisy chain. It is thereby compatible with a wide variety of computer I/O modules. Since its 4 output lines are rated for 100 mA inductive loads, it may also be used to control a variety of other experimental equipment.
Each output in the PFCU-4 is switched by 3 ORed inputs: a front panel switch, a remote TTL input logic level, or RS-232 setting. Output status is shown by a panel LED, output as a TTL logic level, and can be read by RS-232. Thus, if remote control is overridden from the front panel, the actual experimental situation is still reported and can be accurately stored in the remote controller's data record. The outputs are short circuit protected and both short and open conditions are detected and indicated by flashing the LEDs. RS-232 remote control can be made exclusive with a simple command or disabled via front panel switch . The Model PFCU-4 combines with a Model PF4 or PF2S2 and an appropriate cable (3 lengths available) to implement a complete remote-controlled filter or shutter insertion system.

Features

  • Implements manual and computer control of PF4 filter unit, PF2S2 filter-shutter unit, small relays or other experimental equipment.
  • 4 output lines, each at 24V, 5 - 100 mA, short circuit protected.
  • Control via front panel switches, TTL remote control input signals, or RS-232 commands. Reports output activation status via TTL or RS-232.
  • Detects both open and short circuits as error states; short circuit protected.
  • Panel LEDs show normal activation, flash for error states.
  • Simple RS-232 command language allows full control and monitoring of filter/shutter status.
  • Up to 16 PFCU-4 units can be combined on one RS-232 daisy chain.
  • Single width NIM module powered from NIM bin or through RS-232 connector using accessory power supply and adapter.
  • Simplified Experimental Setup
  • Allows remote, "Beam On" selection of filters in front of the sample or in front of the detector in a convenient, rapid and reproducible manner.
  • Automated Data Acquisition
    Implementing computer control over a PF4 lets data with a large dynamic range be collected automatically by allowing the control program to automatically insert calibrated filters when the detected intensity becomes too high, remove them again at lower intensity levels, and record these insertions as part of the data file.
  • Exposure Control
    Implementing computer control over a PF2S2 unit allows software to produce exposures based on input beam intensity, accurately timed exposures, or exposures based on any other experimental parameter of interest.

Specifications

  • Front Panel I/O
    4 SPST switches: "In/Out";
    1 SPST slide switch: "RS-232 Enable".
    2 DB9 Male Plugs: "RS-232 Input" and "RS-232 Output"
  • Rear Panel I/O
    DB9 Female receptacle: 24V, 0-100 mA; diode protected for inductive loads.
    DB9 Male plug: TTL Control and Status.
    Both Active LO.
  • Fault Detection
    Output currents below 3.5 mA are detected as Open Circuits
    Output currents above 110 mA are detected as Shorts and switched off.
  • Power Requirements
    NIM: +12 V @ 200 mA. +24 V @ up to 400 mA, depending on load.
    Alternative RS-232: +24 V @ up to 600 mA, depending on load.
  • Ordering Information
    Dimensions: Single width NIM module.
    Weight: Shipping 3.0 lbs; Net 1.5 lbs.
    Warranty: One year
    Prices: Per Current Price Sheet

PFCU NIM Control Module Datasheet
(114 KB, PDF)
PFCU User's Manual
For current NIM modules with the BLACK front panel as pictured on this page.
(NEW August 2005, 50 KB, PDF)
PFCU NIM Control Module Datasheet
(114 KB, PDF)

 
 

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