Geometry parameters - Revision history

Ruqingxu: /* Usage */

2013-08-16T17:55:10Z

Usage

← Older revision		Revision as of 17:55, 16 August 2013
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	== Usage ==		== Usage ==
			{{Incomplete}}


	Geometry file		Geometry file

Ruqingxu: /* See Also */

2013-08-07T22:31:51Z

Ruqingxu at 21:43, 7 August 2013

2013-08-07T21:43:35Z

← Older revision		Revision as of 21:43, 7 August 2013
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			The geometry parameters defines the 3D spatial relationship between the x-ray beam, the sample, the depth-profiling wire, and the x-ray detectors in the experimental station. Their values are critical for the accuracy of any measurement. The parameters are calibrated regularly by the beamline staff.

			== Meaning of the Parameters ==

	[[Image:Geo_tab.png \| frame]]		[[Image:Geo_tab.png \| frame]]

	~~Meaning~~ of the ~~geometry~~ parameters:		First note that the origin is the focal point of the x-ray beam and is usualy found using a 4-µm thick piece of Si. The beam-line [[34ID-E Coordinate Systems \| coordinate system]] is X is out the door, Y is up, and Z is along the x-ray beam direction. Except for strain refinement, this is the main coordinate system.

			* The size of the detector is given by four parameters, (Nx,Ny) are the number of raw un-binned pixels in the entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of the active area (not distance between middle of pixels). Together these four parameters locate a pixel on the detector.

	~~First note that~~ the origin is the ~~focal point of~~ the x-~~ray beam~~ and is ~~usualy found using~~ a ~~4-µm thick piece~~ of Si. ~~The beam-line [[34ID-E Coordinate Systems~~ \| ~~coordinate system]]~~ is X is ~~out~~ the ~~door, Y~~ is up, and ~~Z is along~~ the x-~~ray beam direction. Except for strain refinement, this~~ is the ~~main coordinate system~~.		* The detector position(s) are specifed using two vectors '''R''' and '''P'''. The base position of the detector is with the plane of the detector containing the origin, and the detector perpendicular to the incident beam. The detector is assumed centered on the incident beam with the detectors x-axis pointing in the +X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector. The actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about the direction of R, and size of the rotation is \|R\|, where \|R\| is in radians. The translation by P is applied first, followed by the rotation. The advantage of this order is that the z component of the P vector gives the distance of the detector center from the origin, and the x and y components show how far off-center of the detector is from a perpendicular line to the origin.

	The ~~size of~~ the detector ~~is given by four~~ parameters~~, (Nx,Ny) are~~ the ~~number of raw un~~-~~binned pixels~~ in the ~~entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of~~ the ~~active area (not distance between middle~~ of ~~pixels). Together these four parameters locate a pixel on~~ the ~~detector~~.		* The "detector ID" is a string that is unique to a detector and should be stored in each image. Thus the computer can associate a detector image with its geometry parameters. You can use the pop-up in the Geometry panel to view the values for all of the defined detectors.

	The ~~detector position(s) are specifed using two vectors '''R'''~~ and ~~'''P'''. The base position~~ of the ~~detector is with~~ the ~~plane of the detector containing the origin~~, ~~and the detector perpendicular to the incident beam~~. The ~~detector~~ is ~~assumed centered on~~ the ~~incident beam with~~ the ~~detectors x-axis pointing in~~ the ~~+X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector~~. The ~~actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about~~ the direction of R, and ~~size of the rotation is \|R\|~~, ~~where \|R\| is in radians~~. The ~~translation by P is applied first, followed by the~~ rotation~~. The advantage of this order is that the z component of the P vector~~ gives the ~~distance~~ of the ~~detector center from~~ the ~~origin, and~~ the ~~x and y components show how far off~~-~~center of the detector is from a perpendicular~~ line ~~to the origin~~.		* The Scanning wire parameters define the location and orientation of the wire. Although provisions exist for describing the wire as "free-standing" or "knife edge", only a free-standing wire exists. The "wire positioner at origin" is the [[Wire Stage \| wire-stage]] position that puts the wire center on the origin. The "axis" gives the direction of the wire axis on the wire-stage, and it will probably be {1,0,0}. The "wire positioner rotation" gives the orientation of the positioner, since the positioner is probably not perfectly aligned with the beam-line coordinates.

	The ~~"detector ID" is a string that is unique~~ to ~~a detector and should be stored in each image. Thus~~ the ~~computer can associate a detector image with its geometry~~ parameters.		* The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.

	~~You can use the pop-up in the Geometry panel to view the values for~~ all ~~of the defined detectors.~~		<br clear = all>

	The Scanning wire parameters define the location and orientation of the wire. Although provisions exist for describing the wire as "free-standing" or "knife edge", only a free-standing wire exists. The "wire positioner at origin" is the [[Wire Stage \| wire-stage]] position that puts the wire center on the origin. The "axis" gives the direction of the wire axis on the wire-stage, and it will probably be {1,0,0}. The "wire positioner rotation" gives the orientation of the positioner, since the positioner is probably not perfectly aligned with the beam-line coordinates.		== Usage ==

	~~The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.~~		Geometry file

	~~<br clear = all>~~		"Geo" tab in LaueGo

	== See Also ==		== See Also ==

Ruqingxu at 21:28, 7 August 2013

2013-08-07T21:28:46Z

← Older revision		Revision as of 21:28, 7 August 2013
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	* [[LaueGo]], the data analysis package		* [[LaueGo]], the data analysis package
	* [[Detectors at 34ID-E]]		* [[Detectors at 34ID-E]]
	* [[34ID E-~~hutch~~]]		* [[34ID E-station]]

Ruqingxu at 21:28, 7 August 2013

2013-08-07T21:28:04Z

← Older revision		Revision as of 21:28, 7 August 2013
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	Meaning of the geometry parameters:		Meaning of the geometry parameters:

	First note that the origin is the focal point of the x-ray beam and is usualy found using a 4-µm thick piece of Si. The beam-line coordinate system is X is out the door, Y is up, and Z is along the x-ray beam direction. Except for strain refinement, this is the main ~~beamline [[34ID-E Coordinate Systems \|~~ coordinate system]].		First note that the origin is the focal point of the x-ray beam and is usualy found using a 4-µm thick piece of Si. The beam-line [[34ID-E Coordinate Systems \| coordinate system]] is X is out the door, Y is up, and Z is along the x-ray beam direction. Except for strain refinement, this is the main coordinate system.

	The size of the detector is given by four parameters, (Nx,Ny) are the number of raw un-binned pixels in the entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of the active area (not distance between middle of pixels). Together these four parameters locate a pixel on the detector.		The size of the detector is given by four parameters, (Nx,Ny) are the number of raw un-binned pixels in the entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of the active area (not distance between middle of pixels). Together these four parameters locate a pixel on the detector.

	The detector position(s) are specifed using two vectors R and P. The base position of the detector is with the plane of the detector containing the origin, and the detector perpendicular to the incident beam. The detector is assumed centered on the incident beam with the detectors x-axis pointing in the +X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector. The actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about the direction of R, and size of the rotation is \|R\|, where \|R\| is in radians. The translation by P is applied first, followed by the rotation. The advantage of this order is that the z component of the P vector gives the distance of the detector center from the origin, and the x and y components show how far off-center of the detector is from a perpendicular line to the origin.		The detector position(s) are specifed using two vectors '''R''' and '''P'''. The base position of the detector is with the plane of the detector containing the origin, and the detector perpendicular to the incident beam. The detector is assumed centered on the incident beam with the detectors x-axis pointing in the +X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector. The actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about the direction of R, and size of the rotation is \|R\|, where \|R\| is in radians. The translation by P is applied first, followed by the rotation. The advantage of this order is that the z component of the P vector gives the distance of the detector center from the origin, and the x and y components show how far off-center of the detector is from a perpendicular line to the origin.

	The "detector ID" is a string that is unique to a detector and should be stored in each image. Thus the computer can associate a detector image with its geometry parameters.		The "detector ID" is a string that is unique to a detector and should be stored in each image. Thus the computer can associate a detector image with its geometry parameters.
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	The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.		The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.

			<br clear = all>

			== See Also ==

			* [[LaueGo]], the data analysis package
			* [[Detectors at 34ID-E]]
			* [[34ID E-hutch]]

Ruqingxu at 21:19, 7 August 2013

2013-08-07T21:19:20Z

← Older revision		Revision as of 21:19, 7 August 2013
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	Meaning of the geometry parameters:		Meaning of the geometry parameters:

	First note that the origin is the ~~focus~~ of the x-ray beam and is usualy found using a 4-µm thick piece of Si. The beam-line coordinate system is X is out the door, Y is up, and Z is along the x-ray beam direction. Except for strain refinement, this is the main beamline [[34ID-E Coordinate Systems \| coordinate system]].		First note that the origin is the focal point of the x-ray beam and is usualy found using a 4-µm thick piece of Si. The beam-line coordinate system is X is out the door, Y is up, and Z is along the x-ray beam direction. Except for strain refinement, this is the main beamline [[34ID-E Coordinate Systems \| coordinate system]].

	The size of the detector is given by four parameters, (Nx,Ny) are the number of raw un-binned pixels in the entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of the active area (not distance between middle of pixels). Together these four parameters locate a pixel on the detector.		The size of the detector is given by four parameters, (Nx,Ny) are the number of raw un-binned pixels in the entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of the active area (not distance between middle of pixels). Together these four parameters locate a pixel on the detector.
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	The detector position(s) are specifed using two vectors R and P. The base position of the detector is with the plane of the detector containing the origin, and the detector perpendicular to the incident beam. The detector is assumed centered on the incident beam with the detectors x-axis pointing in the +X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector. The actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about the direction of R, and size of the rotation is \|R\|, where \|R\| is in radians. The translation by P is applied first, followed by the rotation. The advantage of this order is that the z component of the P vector gives the distance of the detector center from the origin, and the x and y components show how far off-center of the detector is from a perpendicular line to the origin.		The detector position(s) are specifed using two vectors R and P. The base position of the detector is with the plane of the detector containing the origin, and the detector perpendicular to the incident beam. The detector is assumed centered on the incident beam with the detectors x-axis pointing in the +X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector. The actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about the direction of R, and size of the rotation is \|R\|, where \|R\| is in radians. The translation by P is applied first, followed by the rotation. The advantage of this order is that the z component of the P vector gives the distance of the detector center from the origin, and the x and y components show how far off-center of the detector is from a perpendicular line to the origin.

	The "detector ID" is a string that is unique to a detector and should be stored in each image. Thus the computer ~~csn~~ associate a detector ~~imsge~~ with its geometry parameters.		The "detector ID" is a string that is unique to a detector and should be stored in each image. Thus the computer can associate a detector image with its geometry parameters.

	You can use the pop-up in the Geometry panel to view the values for all of the defined detectors.		You can use the pop-up in the Geometry panel to view the values for all of the defined detectors.

	The Scanning wire parameters define the location and orientation of the wire. ~~Althouh~~ provisions exist for describing the wire as "free-standing" or "knife edge", only a free-standing wire exists. The "wire positioner at origin" is the ~~PM500~~ position that puts the wire center on the origin. The "axis" gives the direction of the wire axis on the ~~PM500 (in PM500 units)~~ it will probably be {1,0,0}. The "wire positioner rotation" gives the orientation of the positioner, since the positioner is probably not perfectly aligned with the beam-line ~~coordiates~~.		The Scanning wire parameters define the location and orientation of the wire. Although provisions exist for describing the wire as "free-standing" or "knife edge", only a free-standing wire exists. The "wire positioner at origin" is the [[Wire Stage \| wire-stage]] position that puts the wire center on the origin. The "axis" gives the direction of the wire axis on the wire-stage, and it will probably be {1,0,0}. The "wire positioner rotation" gives the orientation of the positioner, since the positioner is probably not perfectly aligned with the beam-line coordinates.

	The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.		The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.

Ruqingxu at 21:10, 7 August 2013

2013-08-07T21:10:35Z

← Older revision		Revision as of 21:10, 7 August 2013
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	[[Image:~~Geo~~.png \| frame]]		[[Image:Geo_tab.png \| frame]]

	Meaning of the geometry parameters:		Meaning of the geometry parameters:

Ruqingxu: Created page with " frame Meaning of the geometry parameters: First note that the origin is the focus of the x-ray beam and is usualy found using a 4-µm thick piece of Si. T..."

2013-08-07T21:08:50Z

Created page with " frame Meaning of the geometry parameters: First note that the origin is the focus of the x-ray beam and is usualy found using a 4-µm thick piece of Si. T..."

New page

[[Image:Geo.png | frame]]

Meaning of the geometry parameters:

First note that the origin is the focus of the x-ray beam and is usualy found using a 4-µm thick piece of Si. The beam-line coordinate system is X is out the door, Y is up, and Z is along the x-ray beam direction. Except for strain refinement, this is the main beamline [[34ID-E Coordinate Systems | coordinate system]].

The size of the detector is given by four parameters, (Nx,Ny) are the number of raw un-binned pixels in the entire detector. The two parameters X(mm) and Y(mm) are the outside dimensions of the active area (not distance between middle of pixels). Together these four parameters locate a pixel on the detector.

The detector position(s) are specifed using two vectors R and P. The base position of the detector is with the plane of the detector containing the origin, and the detector perpendicular to the incident beam. The detector is assumed centered on the incident beam with the detectors x-axis pointing in the +X direction and y-axis pointing in +Y direction. This is, of course, not a useful location for a detector. The actual detector position is obtained by then doing a translation of vector P followed by a rotation about vector R. R specifies a rotation about the direction of R, and size of the rotation is |R|, where |R| is in radians. The translation by P is applied first, followed by the rotation. The advantage of this order is that the z component of the P vector gives the distance of the detector center from the origin, and the x and y components show how far off-center of the detector is from a perpendicular line to the origin.

The "detector ID" is a string that is unique to a detector and should be stored in each image. Thus the computer csn associate a detector imsge with its geometry parameters.

You can use the pop-up in the Geometry panel to view the values for all of the defined detectors.

The Scanning wire parameters define the location and orientation of the wire. Althouh provisions exist for describing the wire as "free-standing" or "knife edge", only a free-standing wire exists. The "wire positioner at origin" is the PM500 position that puts the wire center on the origin. The "axis" gives the direction of the wire axis on the PM500 (in PM500 units) it will probably be {1,0,0}. The "wire positioner rotation" gives the orientation of the positioner, since the positioner is probably not perfectly aligned with the beam-line coordiates.

The Sample parameters can be used to specify the origin of the the sample using the positioner, but these parameters are generally not used.

← Older revision		Revision as of 22:31, 7 August 2013
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	* [[LaueGo]], the data analysis package		* [[LaueGo]], the data analysis package
	* [[~~Detectors at~~ 34ID-E]]		* [[34ID-E Detectors]]
	* [[34ID E-station]]		* [[34ID E-station]]