Gates - Revision history

Gshotts at 16:30, 13 June 2025

2025-06-13T16:30:46Z

← Older revision		Revision as of 11:30, 13 June 2025
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	''See Also: [[Gate Features]]''		''See Also: [[Gate Features]]''
	[[File:GateTypes.png\|thumb\|Gate types as shown on the [[Digital Oscilloscope]] Gate Controls]]		[[File:GateTypes.png\|thumb\|Gate types as shown on the [[Digital Oscilloscope]] Gate Controls]]
	<p>Gates and Regions are spans of time on a digitized waveform from which data is extracted. At minimum, all gates have a Start Time and a Length. Most gates also have a Threshold to determine a level at which to keep data. Gates that do not have thresholds are called Regions (with one exception).</p>		<p>[[Glossary of Terms#G\|Gates]] and [[Glossary of Terms#R\|Regions]] are spans of time on a digitized waveform from which data is extracted. At minimum, all gates have a Start Time and a Length. Most gates also have a Threshold to determine a level at which to keep data. Gates that do not have thresholds are called Regions (with one exception).</p>

	<p>A collection of gates is called a '''''Gate Tree'''''. This is due to the parent-child relationships among gates, giving rise to a "tree" type structure.</p>		<p>A collection of gates is called a '''''Gate Tree'''''. This is due to the parent-child relationships among gates, giving rise to a "tree" type structure.</p>

Gshotts: /* Relative Threshold Gates */

2025-06-13T15:52:56Z

Relative Threshold Gates

← Older revision		Revision as of 10:52, 13 June 2025
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	<p>on the [[~~Basic Controls#~~Digital Oscilloscope\|Digital Oscilloscope]], if a phase inversion is found, the depth indicator above the signal will show as <span style="color:red">red</span> or <span style="background-color:yellow">yellow</span>, depending on the intensity of the signal.</p>		<p>on the [[Digital Oscilloscope\|Digital Oscilloscope]], if a phase inversion is found, the depth indicator above the signal will show as <span style="color:red">red</span> or <span style="background-color:yellow">yellow</span>, depending on the intensity of the signal.</p>

	''See Also: [[Phase Inversion Detection]]''		''See Also: [[Phase Inversion Detection]]''

Gshotts: /* Relative Threshold Gates */

2025-05-28T16:37:43Z

Relative Threshold Gates

← Older revision		Revision as of 11:37, 28 May 2025
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	- '''Negative Relative Threshold''': this gate checks for a negative crossing. The existence and/or position of the negative threshold crossing is critical for the determination of Phase Inversion. On the Scope, this threshold is represented by a single negative-going solid line.		- '''Negative Relative Threshold''': this gate checks for a negative crossing. The existence and/or position of the negative threshold crossing is critical for the determination of Phase Inversion. On the Scope, this threshold is represented by a single negative-going solid line.

	<p>''Note that the inputs for the Data Detect and Consider ~~for Delam~~ thresholds are in Volts or %FSH, whereas the Positive and Negative Relative thresholds are in percent (%). This is because the voltage value of the relative thresholds will vary based on the Amplitude of the signal. For example, if you have a absolute peak signal of 0.5V and a Relative Threshold of 50%, the threshold will be set at 0.25V. If the absolute peak signal rises to 0.6V, the Relative Threshold moves to 0.3V. Thus, relative threshold position is a '''percentage''' of a peak, and not a fixed voltage.''</p>		<p>''Note that the inputs for the Data Detect and Consider thresholds are in Volts or %FSH, whereas the Positive and Negative Relative thresholds are in percent (%). This is because the voltage value of the relative thresholds will vary based on the Amplitude of the signal. For example, if you have a absolute peak signal of 0.5V and a Relative Threshold of 50%, the threshold will be set at 0.25V. If the absolute peak signal rises to 0.6V, the Relative Threshold moves to 0.3V. Thus, relative threshold position is a '''percentage''' of a peak, and not a fixed voltage.''</p>

	<p>Relative Threshold Gates generate two sets of data: an Absolute Peak Amplitude map, and a Threshold Map, showing places where higher or lower intensity phase inversion is detected. High phase inversion is shown in <span style="color:red">red</span>, and low phase inversion is shown in <span style="background-color:yellow">yellow</span>.		<p>Relative Threshold Gates generate two sets of data: an Absolute Peak Amplitude map, and a Threshold Map, showing places where higher or lower intensity phase inversion is detected. High phase inversion is shown in <span style="color:red">red</span>, and low phase inversion is shown in <span style="background-color:yellow">yellow</span>.

Gshotts: /* Relative Threshold Gates */

2025-05-28T16:37:28Z

Relative Threshold Gates

← Older revision		Revision as of 11:37, 28 May 2025
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	<p>The Relative Threshold gate contains the following settings:</p>		<p>The Relative Threshold gate contains the following settings:</p>
	- '''Data Detect Threshold''': this is the threshold at which Absolute Peak Amplitude data is collected. On the Scope, it is represented by a box. Below this threshold, data is ignored and no test for Phase Inversion will be performed.<br>		- '''Data Detect Threshold''': this is the threshold at which Absolute Peak Amplitude data is collected. On the Scope, it is represented by a box. Below this threshold, data is ignored and no test for Phase Inversion will be performed.<br>
	- '''Consider ~~for Delam~~ Threshold''': a second threshold at which the algorithm will check for Phase Inversion. This should be set at or above the Data Detect threshold. On the Scope, Consider ~~for Delam~~ Threshold is represented by two dark dashed lines.<br>		- '''Consider Threshold''': a second threshold at which the algorithm will check for Phase Inversion. This should be set at or above the Data Detect threshold. On the Scope, Consider Threshold is represented by two dark dashed lines.<br>

	- '''Positive Relative Thresholds 1 and 2''': these are the thresholds that determine the intensity of the Phase Inversion. If threshold 2 is crossed, the resulting RTG map pixel will be <span style="color:red">red</span>, and if threshold 1 is crossed the pixel will be <span style="background-color:yellow">yellow</span>. On the Scope, these are represented by two positive-going solid lines.<br>		- '''Positive Relative Thresholds 1 and 2''': these are the thresholds that determine the intensity of the Phase Inversion. If threshold 2 is crossed, the resulting RTG map pixel will be <span style="color:red">red</span>, and if threshold 1 is crossed the pixel will be <span style="background-color:yellow">yellow</span>. On the Scope, these are represented by two positive-going solid lines.<br>

Gshotts: /* Relative Threshold Gates */

2025-05-28T16:36:58Z

Relative Threshold Gates

← Older revision		Revision as of 11:36, 28 May 2025
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	[[File:RTGGate2.png\|left\|thumb\|RTG Gate]]		[[File:RTGGate2.png\|left\|thumb\|RTG Gate]]
	[[File:RTGGate1.png\|thumb\|RTG Gate with ~~Delamination~~ detected]]		[[File:RTGGate1.png\|thumb\|RTG Gate with Phase Inversion detected]]
	[[File:GateRTGSetup.png\|thumb\|RTG Gate Setup (Basic Mode)]]		[[File:GateRTGSetup.png\|thumb\|RTG Gate Setup (Basic Mode)]]
	<p>Relative Threshold Gates (RTG) allow a user to set thresholds based on a relative amplitude, rather than a fixed threshold. By setting a Relative threshold gate appropriately, phase inversion can be detected.</p>		<p>Relative Threshold Gates (RTG) allow a user to set thresholds based on a relative amplitude, rather than a fixed threshold. By setting a Relative threshold gate appropriately, phase inversion can be detected.</p>

Gshotts: /* Data Gates */

2025-05-28T16:36:42Z

Data Gates

← Older revision		Revision as of 11:36, 28 May 2025
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	<p>To create a Data Gate, turn on "Data1" or "Data2" on the Setup form (Basic Mode), or create a Data gate using the Scope tools (Advanced mode)</p>		<p>To create a Data Gate, turn on "Data1" or "Data2" on the Setup form (Basic Mode), or create a Data gate using the Scope tools (Advanced mode)</p>

	<p>Data Gates also contain features for generating Void images or PCM [[~~Delamination~~ Detection#~~Delamination~~ Detection using PCM Mode\|~~Delamination~~ Detection]].</p>		<p>Data Gates also contain features for generating Void images or PCM [[Phase Inversion Detection#Phase Inversion Detection using PCM Mode\|Phase Inversion Detection]].</p>

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Gshotts: /* Relative Threshold Gates */

2025-05-28T16:35:31Z

Relative Threshold Gates

← Older revision		Revision as of 11:35, 28 May 2025
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	<p>on the [[Basic Controls#Digital Oscilloscope\|Digital Oscilloscope]], if a phase inversion is found, the depth indicator above the signal will show as <span style="color:red">red</span> or <span style="background-color:yellow">yellow</span>, depending on the intensity of the signal.</p>		<p>on the [[Basic Controls#Digital Oscilloscope\|Digital Oscilloscope]], if a phase inversion is found, the depth indicator above the signal will show as <span style="color:red">red</span> or <span style="background-color:yellow">yellow</span>, depending on the intensity of the signal.</p>

	''See Also: [[~~Delamination~~ Detection]]''		''See Also: [[Phase Inversion Detection]]''
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Gshotts: /* FFT Gates */

2024-01-17T21:10:59Z

FFT Gates

← Older revision		Revision as of 16:10, 17 January 2024
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	[[File:FFTWithGates.png\|left\|thumb\|FFT Display with Gates]]		[[File:FFTWithGates.png\|left\|thumb\|FFT Display with Gates]]
	When displaying the Magnitude Spectrum of the FFT, the user can create Frequency Gates that cover certain frequency ranges.		When displaying the Magnitude Spectrum of the FFT, the user can create Frequency Gates that cover certain frequency ranges.
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	====Waveform Collection Region (B-Scans)====		====Waveform Collection Region (B-Scans)====

Gshotts: /* FFT Gates */

2024-01-17T21:10:25Z

FFT Gates

← Older revision		Revision as of 16:10, 17 January 2024
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	=====FFT Gates=====		=====FFT Gates=====
	[[File:~~FFTGates~~.png\|left\|thumb\|FFT Display with Gates]]		[[File:FFTWithGates.png\|left\|thumb\|FFT Display with Gates]]
	When displaying the Magnitude Spectrum of the FFT, the user can create Frequency Gates that cover certain frequency ranges.		When displaying the Magnitude Spectrum of the FFT, the user can create Frequency Gates that cover certain frequency ranges.

Gshotts: /* FFT Gates */

2024-01-17T21:09:42Z

FFT Gates

← Older revision		Revision as of 16:09, 17 January 2024
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	=====FFT Gates=====		=====FFT Gates=====
			[[File:FFTGates.png\|left\|thumb\|FFT Display with Gates]]
	When displaying the Magnitude Spectrum of the FFT, the user can create Frequency Gates that cover certain frequency ranges.		When displaying the Magnitude Spectrum of the FFT, the user can create Frequency Gates that cover certain frequency ranges.