6.4

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Investigating Data

The Pick tab on the controls panel allows you to see the data in the workspace.

The Toolbar

PickTabToolButtons.png
  • PickTabZoomButton.png - Navigate in the instrument display window (Zoom).
  • PickTabEditButton.png - Edit a shape.
  • PickTabEllipseButton.png - Draw an ellipse.
  • PickTabRectButton.png - Draw a rectangle.
  • PickTabElRingButton.png - Draw an elliptical ring.
  • PickTabRectRingButton.png - Draw a rectangular ring.
  • PickTabSectorButton.png - Draw a circular sector.
  • PickTabArbitraryShape.png - Draw an arbitrary shape.
  • PickTabPickPixelButton.png - Select a single detector.
  • PickTabPickTubeButton.png - Select a tube/bank.
  • PickTabAddPeakButton.png - Add a single crystal peak.
  • PickTabEraseButton.png - Erase a peak.
  • PickTabCPCompare.png - Compare single crystal peaks.
  • PickTabCPAlign.png - Crystal Peak alignment tool.

Picking a Single Detector

The Single Pixel tool PickSingleDetector.png displays the detector data in the mini-plot at the bottom of the tab.

Miniplot.png

Hover the mouse over a detector and see the mini-plot update. To zoom in on this mini-plot, select the PickTabAddPeakButton.png button, then click and drag on the mini-plot. If you don’t drag (just click), you will add a SingleCrystalPeak (appearing in a new TableWorkspace).

Picking a Tube

The Tube selection tool PickTube.png is useful for tube instruments. When it’s on the mini-plot displays the integrated data in the whole tube. The integration is done either over the detectors in the tube (Sum option) or over time (Integrate). To switch between the options, right-click on the mini-plot to display the following menu:

SumIntegrateMenu.png

Summing over the detectors

With the Sum option the mini-plot displays a sum of the counts in all detectors in a tube vs time of flight.

MiniplotSum.png

Integrating over the time of flight

With the Integrate option the mini-plot displays the counts integrated over time of flight vs detector position in the tube.

MiniplotIntegrate.png
Detector positions can be shown as detector IDs, or distance from a tube’s end, or the φ angle. Switch between the units using the mini-plot’s context menu.
DetectorPositionOptions.png

Data integration slider

Edit the range over the X-axis (e.g. Time) that the data is displayed by altering the data integration slider at the bottom of the Instrument Viewer. Drag the ends of the slider or input exact start and end values.

Selecting Arbitrary Sets of Detectors

The rest of the buttons in the top row are for making complex selections. Buttons PickTabEllipseButton.pngPickTabRectButton.pngPickTabElRingButton.pngPickTabRectRingButton.png are for drawing shapes, PickTabEditButton.png is for editing them.

Draw an ellipse

  1. Click the PickTabEllipseButton.png button.
  2. Click and hold the mouse button down to start drawing.
  3. Drag to resize.
DrawingEllipse.png

Edit a shape

  1. Switch on the editing tool PickTabEditButton.png. This tool is automatically selected after drawing a shape.
  2. Click on a shape you would like to edit. The selected shape displays control points as small white rectangles.
  3. Drag the control points to resize the shape.
  4. To translate the shape click inside its shaded area and drag.

To select multiple shapes draw a box around them.

SelectMuplipleShapes.png
  1. Copy selected shapes using Ctrl+C. Then paste them as much as you like using Ctrl+V.

The selected shapes are indicated by drawing a bounding box around each of them.

SelectedMuplipleShapes.png

Only translation is possible for a multiple selection.

Sum selected detectors

The mini-plot automatically sums the counts in the detectors covered by the shapes and plots this vs time of flight.