RingProfile dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| InputWorkspace | Input | MatrixWorkspace | Mandatory | An input workspace. |
| OutputWorkspace | Output | MatrixWorkspace | Mandatory | An output workspace. |
| Centre | Input | dbl list | 0,0,0 | Coordinate of the centre of the ring |
| MinRadius | Input | number | 0 | Radius of the inner ring(m) |
| MaxRadius | Input | number | Optional | Radius of the outer ring(m) |
| NumBins | Input | number | 100 | Number of slice bins for the output |
| StartAngle | Input | number | 0 | The angle to start from. |
| Sense | Input | string | Anti-ClockWise | The direction of the integration around the ring. Allowed values: [‘ClockWise’, ‘Anti-ClockWise’] |
RingProfile sums the counts against a ring.
Below, there is an example of the execution of the RingProfile to a Workspace2D where the position of the pixels are not associated to detector positions, but it is derived from the Axes.
The image below shows a visual interpretation for the inputs of the algorithm
The algorithm goes through each pixel and find its distance from the center. If it relies inside the defined ring, it checks the angle between the pixel position and the center and uses this information to define the bin where to put the count for that pixel.
The RingProfile is also defined for Workspace2D which has the positions based on the detectors, as you can see in the picture below.
In this case, the inputs of the algorithm is like the image below
The algorithm does to each spectrum, get the associated detector from which it get the positions. From the positions it work out if it belongs or not to the ring and in which bin it must be placed. It finally accumulate all the spectrum values inside the target bin.
It is possible to setup the StartAngle from where to starting the Ring as well as the Sense, if in clockwise direction or anti-clockwise direction. But, the resulting workspace will always place the bins in a relative angle position from the start. Which means that for anti-clockwise sense, the real 3D angle is:
RealAngle = StartAngle + Angle
While for clockwise sense, the real 3D angle is:
RealAngle = StartAngle - Angle
Example - A complete Circle - no inner radius
ws = CreateSampleWorkspace("Histogram","Multiple Peaks")
wsOut = RingProfile(ws,Centre=[0,5,10],MaxRadius=5)
print("The RingProfile has been calculated with {} bins".format(wsOut.blocksize()))
Output:
The RingProfile has been calculated with 100 bins
Example - A ring
ws = CreateSampleWorkspace("Histogram","Multiple Peaks")
wsOut = RingProfile(ws,Centre=[0,5,10],MinRadius=1,MaxRadius=5,NumBins=200)
print("The RingProfile has been calculated with {} bins".format(wsOut.blocksize()))
Output:
The RingProfile has been calculated with 200 bins
Categories: Algorithms | Transforms\Grouping
C++ source: RingProfile.cpp (last modified: 2017-09-12)
C++ header: RingProfile.h (last modified: 2016-09-07)