Guinier Camera G670

For the first time the Huber G670 offers a modern image plate detection method in the Guinier geometry.

In many Guinier cameras the over 100 years old wet film technique has been replaced by step-by-step counting scintillation and proportional detectors. Although this enables digital data acquisition, measurement times can not be significantly reduced and remain in the range of hours to days.

In contrast to this, the desired data is available within a few minutes with Huber's image plate detection method. The only similarities with classical Guinier cameras are the geometry and the high resolution - instead, the Huber G670 can be seen as a fully-fledged diffractometer.

In addition to the image memory foil, the housing of the 670 camera contains the laser recording unit with photomultiplier and pre-amplifier as well as the halogen deleting lamp. This compact Guinier powder diffractometer unites the high resolution of the old analog wet film method with the high sensitivity of image plate detection technology. Thus it is capable of providing digital powder diffractograms within the shortest possible time which can then be processed further by Rietveld analysis or similar methods.
The provided measurement software runs under MS-Windows and generates diffractogram files with up to 20001 points in all standard file formats.

What is an image plate?

A flexible mounting foil made of polyester is coated with a homogenous powder
consisting of crystallites (particle size approx. 0.005mm) of a luminescent storage
material, namely photo-stimulatable phosphor consisting of bariumflourobromide
with trace amounts of Europium with a valence of 2 which acts as a luminescence
centre (BaFBr:Eu2+).

The image storage foil is positioned in the Guinier camera 670 with the sensitive
side facing inward precisely on the focal circle with a radius of 90mm. It is exposed
in the same way as the previously used wet film. After this, the image plate is
scanned by a vertical linear red diode laser beam within approximately 5 seconds.

The thus resulting blue photostimulated liminescence (PSL) emanating from the
areas subject to X-ray exposure is amplified during the scanning process by a
photomultiplier and then registered. This initially analog signal is then converted
into digital number counts by a 16-bit A/D converter.

By means of a white halogen lamp it is possible to delete the registered image
structure within 10 seconds. After this process the Guinier camera is ready for
the next image.

 

Technical data:

Max. number of measurement points: 20001
Step size (2-Theta): 0.005°
Bragg angle area (asymm. transmission): 0°...100°
Bragg angle area (17° Reflexion): 50°...150°
Focal circle radius [mm]: 90
A/D converter resolution [Bit]: 16
Signal dynamics (counts): 200000
Simple read time [sec]: < 5
Deletion time [sec]: 10
   
Hardware requirements:  
X-ray source (fine line focus) [mm]: 0.4*8
Beam height above table [mm]: approx. 275
Required working area next to the tube [mm]: approx. 600*500

Up-to-date MS-Windows PC with three free PCI slots

Sample supports and environments

The 670 camera housing with the measurement electronics is shielded from ambient light and self-contained. The X-rays diffracted in the sample enter the camera by means of a side-mounted incidence window.

Various different sample supports are available which can be reproducibly attached to the outside of the camera housing by means of two screws.

Downloads

Download as PDF (EN)
Catalogue PDF (EN)

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