Determination of the Speed of Sound - Revision history

Ist165721: Text replacement - "\]" to ""

2015-05-24T19:06:46Z

Text replacement - "\]" to "</math>"

Ist165721: Text replacement - "\[" to " $"$

2015-05-24T18:41:57Z

Text replacement - "\[" to "<math>"

Ist128595 at 22:57, 18 October 2013

2013-10-18T22:57:14Z

Ist128595 at 22:43, 18 October 2013

2013-10-18T22:43:43Z

Ist165721 at 15:58, 12 March 2013

2013-03-12T15:58:58Z

Ist165721: /* Protocol */

2013-03-12T15:58:26Z

Protocol

Ist165721 at 11:29, 12 March 2013

2013-03-12T11:29:35Z

Ist165721 at 11:21, 12 March 2013

2013-03-12T11:21:18Z

Ist165721 at 11:18, 12 March 2013

2013-03-12T11:18:11Z

Ist165721 at 11:17, 12 March 2013

2013-03-12T11:17:36Z

@@ Line 60: / Line 60: @@
 <math>
 v_{sound} = \frac{\Delta s}{\Delta t}
-\]
+</math>
 where \(s\) is the distance between the selected microphones.
 Of course, other waveforms could be used but this would require a closer look at the signals phase.

@@ Line 58: / Line 58: @@
 To determine \( v_{sound} \), the user must choose a "pulse" type of stimulus and measure the "time-of-flight" taken by the wave from Mic 1 and any other microphone. The speed can be determined with data from table 1 and the formula for speed determination:
-\[
+<math>
 v_{sound} = \frac{\Delta s}{\Delta t}
 \]

@@ Line 20: / Line 20: @@
 =Experimental Apparatus=
-The apparatus (sometimes referred as "Kundt's tube") consists of a 1458 mm lon PVC tube. On one end there is a fixed speaker that can produce an audio sine, triangular or single pulse wave. On the opposite side there is a movable piston for changing the effective tube length. Along the tube there are several microphones to register the sound intensity at some fixed points.
+The apparatus (sometimes referred as "Kundt's tube") consists of a 1458 mm lon PVC tube. On one end there is a fixed speaker that can produce an audio sine, triangular or single pulse wave. On the opposite side there is a movable piston to change the effective tube length. Along the tube there are several microphones to register the sound intensity at some fixed points.
 The following table shows the positions of the microphones in relation to the source (speaker):
@@ Line 47: / Line 47: @@
-The reference mic (Mic 1) should be used to verify that the emitted sound is the required one (i.e., there is no distortion caused by the speaker). On the piston surface there is another microphone (Mic 4) capable of moving between 1269mm and 1475mm.
+The reference mic (Mic 1) should be used to verify that the  sound is emitted as desired (i.e., there is no distortion caused by the speaker). On the piston surface there is another microphone (Mic 4) capable of moving between 1269mm and 1475mm.
 The sound is acquired through 2 channels of a sound card: the left channel (CH 1) is always bounded to the reference microphone (Mic 1); the other channel (CH 2) can be connected to one of the other three microphones.
-The experimental data is captured by the PC's sound-card and processed on-line (normalization) prior to be received by the user.
+The experimental data is captured by the PC's sound-card and processed on-line (normalization) before being received by the user.
@@ Line 62: / Line 62: @@
 \]
 where \(s\) is the distance between the selected microphones.
-Of course, other waveforms could be used but this would require a close look at the signals phase.
+Of course, other waveforms could be used but this would require a closer look at the signals phase.

@@ Line 20: / Line 20: @@
 =Experimental Apparatus=
-The apparatus (sometimes referred as "Kundt's tube") consists in a PVC tube with 1458 mm in length. On one end there is a fixed speaker that can produce an audio sine, triangular or single pulse wave. On the opposite side there is a movable piston for changing the effective tube length. Along the tube there are several microphones to register the sound intensity at fixed points.
+The apparatus (sometimes referred as "Kundt's tube") consists of a 1458 mm lon PVC tube. On one end there is a fixed speaker that can produce an audio sine, triangular or single pulse wave. On the opposite side there is a movable piston for changing the effective tube length. Along the tube there are several microphones to register the sound intensity at some fixed points.
 The following table shows the positions of the microphones in relation to the source (speaker):
@@ Line 47: / Line 47: @@
-The reference mic (Mic 1) should be used to verify that the emitted sound is the desired (i.e., there is no distortion caused by the speaker). On the piston surface is another microphone (Mic 4) capable of moving between 1269mm and 1475mm with it.
+The reference mic (Mic 1) should be used to verify that the emitted sound is the required one (i.e., there is no distortion caused by the speaker). On the piston surface there is another microphone (Mic 4) capable of moving between 1269mm and 1475mm.
 The sound is acquired through 2 channels of a sound card: the left channel (CH 1) is always bounded to the reference microphone (Mic 1); the other channel (CH 2) can be connected to one of the other three microphones.
-The experimental data is captured by the PC's sound-card and processed on-line (normalization) prior to be receive by the user.
+The experimental data is captured by the PC's sound-card and processed on-line (normalization) prior to be received by the user.
@@ Line 62: / Line 62: @@
 \]
 where \(s\) is the distance between the selected microphones.
-Of course, other waveforms could be used but this will require a close look at the signals phase.
+Of course, other waveforms could be used but this would require a close look at the signals phase.
 =Advanced Protocol=
-Using the coherence function between the acquired signals the phase determination can improve with higher accuracy among different microphones. Using an appropriate software package (like Matlab or Octave for instance) this phase is easily determined (mscohere). Pink or white noise are very suitable for that end as it won't exhibits any phase indetermination.
+Using the coherence function between the acquired signals, the phase determination can improve with higher accuracy among different microphones. Using an appropriate software package (like Matlab or Octave for instance) this phase is easily determined (mscohere). Pink or white noise are very suitable for this purpose as they won't show any phase indetermination.
 =Links=
 *[[Determinação da Velocidade do Som | Portuguese Version (Versão em Português)]]

@@ Line 51: / Line 51: @@
 The experimental data is captured by the PC's sound-card and processed on-line (normalization) prior to be receive by the user.
 =Protocol=
@@ Line 66: / Line 67: @@
 =Advanced Protocol=
 Using the coherence function between the acquired signals the phase determination can improve with higher accuracy among different microphones. Using an appropriate software package (like Matlab or Octave for instance) this phase is easily determined (mscohere). Pink or white noise are very suitable for that end as it won't exhibits any phase indetermination.
 =Links=
 *[[Determinação da Velocidade do Som | Portuguese Version (Versão em Português)]]

@@ Line 63: / Line 63: @@
 Of course other waveforms could be used but this will require a close look at the signals phase.
 =Advanced Protocol=
 Using the coherence function between the acquired signals the phase determination can improve with higher accuracy among different microphones. Using an appropriate software package like matlab or octave for instance this phase is easily determined (mscohere). Pink or white noise are very suitable for that end as it won't exhibits any phase indetermination.
 =Links=
 *[[Determinação da Velocidade do Som | Portuguese Version (Versão em Português)]]

← Older revision		Revision as of 11:21, 12 March 2013
Line 65:		Line 65:
	=Advanced Protocol=		=Advanced Protocol=
	Using the coherence function between the acquired signals the phase determination can improve with higher accuracy among different microphones. Using an appropriate software package like matlab or octave for instance this phase is easily determined (mscohere). Pink or white noise are very suitable for that end as it won't exhibits any phase indetermination.		Using the coherence function between the acquired signals the phase determination can improve with higher accuracy among different microphones. Using an appropriate software package like matlab or octave for instance this phase is easily determined (mscohere). Pink or white noise are very suitable for that end as it won't exhibits any phase indetermination.
		+
		+
		+	=Links=
		+	*[[Determinação da Velocidade do Som \| Portuguese Version (Versão em Português)]]

@@ Line 4: / Line 4: @@
 <div class="toccolours mw-collapsible mw-collapsed" style="width:420px">
-'''Caixa de Ligações'''
+'''Links'''
 <div class="mw-collapsible-content">

@@ Line 1: / Line 1: @@
 =Description of the Experiment=
 The purpose of this experiment is to determine the speed of sound.
 =Experimental Apparatus=