Semi-cilinder Optical Behavior - Revision history

Ist128595 at 19:14, 22 October 2013

2013-10-22T19:14:40Z

Ist128595 at 19:07, 22 October 2013

2013-10-22T19:07:24Z

Ist165721: /* Links */

2013-06-04T17:23:07Z

Links

Ist165721 at 20:55, 2 June 2013

2013-06-02T20:55:15Z

Ist165721: /* Links */

2013-03-15T19:21:05Z

Links

Ist165721 at 19:20, 15 March 2013

2013-03-15T19:20:48Z

Ist165721: /* Protocol I */

2012-05-28T14:28:21Z

Protocol I

Ist165721: /* Protocol II */

2012-05-28T14:27:47Z

Protocol II

Ist165721: /* Protocol II */ Texto inicial desta subsecção.

2012-05-28T14:27:10Z

Protocol II: Texto inicial desta subsecção.

Ist165721: /* Description of the Experiment */ Adicionada caixa de ligações

2012-05-27T23:20:13Z

Description of the Experiment: Adicionada caixa de ligações

@@ Line 37: / Line 37: @@
 ==Protocol III==
-According to Snell's Law, there is an angle (it's called the Critical Angle and only exists in the case of light crossing from an optically denser material to a lesser one) where there is no transmitted beam, because the incident beam was completely reflected in the contact surface between the two materials.
+According to Snell's Law, there is an angle (it's called the Critical Angle and only exists in the case of light crossing from an optically denser material to a less dense one) where there is no transmitted beam, because the incident beam was completely reflected in the contact surface between the two materials.
-After determining the refraction index ([[#Protocol I|Protocol I]]), this angle can be calculated and the user can verify through experiment that there is no transmission beyond it. We recommend looking at the reflected and transmitted power in the neighborhood of this angle, through small increases and find a mathematical function that best fits these points. The angles used should be between 90º and 180º (these correspond to a transition from the denser material to the less dense one).
+After determining the refraction index ([[#Protocol I|Protocol I]]), this angle can be calculated and the user can verify through experiment that there is no transmission beyond it. We recommend looking at the reflected and transmitted power in the neighborhood of this angle through small increases and find a mathematical function that best fits these points. The angles used should be between 90º and 180º (these correspond to a transition from the denser material to the less dense one).

@@ Line 1: / Line 1: @@
 =Description of the Experiment=
 This experiment has multiple purposes:
-# Determine the refraction index of Plexiglas and verify Snell's law;
+# To determine the refraction index of Plexiglas and verify Snell's law;
-# Measure the critical angle at which there is total internal reflection;
+# To measure the critical angle at which there is total internal reflection;
-# Study the power transmited and reflected in an optical interface, proving conservation of energy;
+# To study the power transmitted and reflected in an optical interface, proving conservation of energy;
-# Study the power transmited and reflected as a function of laser polarization, determining Brewster's angle.
+# To study the power transmitted and reflected as a function of laser polarization, determining the Brewster's angle.
-This analisis can be done qualitatively by processing the picture from the camera or quantitatively by using the light sensor that sweeps the semicilinder angle-wise. Because of experimental constraints, the avaliable angle range is only 0º through 240º.
+This analysis can be done qualitatively by processing the picture from the camera or quantitatively by using the light sensor that sweeps the semicilinder angle-wise. Due to experimental constraints, the avaliable angle range is only 0º through 240º.
@@ Line 25: / Line 25: @@
 ==Protocol I==
-The ray tracer mode allows a qualitative analysis of the transmission and reflection of light in the interface between Plexiglas and air through the pictures captured by the camera.
+The ray tracing mode allows a qualitative analysis of the transmission and reflection of light in the interface between Plexiglas and air through the pictures captured by the camera.
-The user chooses the starting and ending angle for the sweep. With some pictures and Snell's law it is possible to calculate the refraction index for the denser material (Plexiglas). We suggest using an image processing software like Corelpaint, Photoshop or Draw (openoffice.org) to analyse the pictures: simply find the light rays and measure the angle between them.
+The user chooses the starting and the ending angle for the sweep. With some pictures and Snell's law it is possible to calculate the refraction index for the denser material (Plexiglas). We suggest using an image processing software like Corelpaint, Photoshop or Draw (openoffice.org) to analyse the pictures: simply find the light rays and measure the angle between them.
 Note: selecting angles between 0º and 180º means the light will shine upon the curved side of the semi-cylinder, whereas between 180º and 360º the light will shine on the straight side.
 ==Protocol II==
-In "direct light" mode, the user selects the angle at which light shines upon the cylinder, and during the experiment itself the output will be the laser's intensity. Usually, two maxima can be found when sweeping the circle: one is the transmitted ray and the other the reflected one.
+In "direct light" mode, the user selects the angle at which light shines upon the cylinder, and during the experiment itself the output will be the laser intensity. Two maxima can usually be found when sweeping the circle: one is the transmitted ray and the other the reflected one.
-At 0º, the user can determine the laser's absolute power. We also suggest angles in [90º:180º] to study the Plexiglas-air interface and [270º-360º] for air-Plexiglas interface.
+At 0º, the user can determine the laser absolute power. We also suggest angles in [90º:180º] to study the Plexiglas-air interface and [270º-360º] for air-Plexiglas interface.
 This procedure can be done with; (i) non-polarized light, (ii) vertically polarized light, (iii) horizontally polarized light.
 ==Protocol III==
-According to Snell's Law, there is an angle (it's called the Critical Angle, and only exists in the case of light crossing from a optically denser material to a lesser one) where there is no transmitted beam, because the incident beam was completely reflected in the contact surface between the two materials.
+According to Snell's Law, there is an angle (it's called the Critical Angle and only exists in the case of light crossing from an optically denser material to a lesser one) where there is no transmitted beam, because the incident beam was completely reflected in the contact surface between the two materials.
-After determining the refraction index ([[#Protocol I|Protocol I]]), this angle can be calculated, and the user can verify through experiment that there is no transmission beyond it. We recommend looking at the reflected and transmitted power in the neighborhood of this angle, through small increases and find a mathematical function that best fits these points. The angles used should be between 90º and 180º (these correspond to a transition from the denser material to the less dense one).
+After determining the refraction index ([[#Protocol I|Protocol I]]), this angle can be calculated and the user can verify through experiment that there is no transmission beyond it. We recommend looking at the reflected and transmitted power in the neighborhood of this angle, through small increases and find a mathematical function that best fits these points. The angles used should be between 90º and 180º (these correspond to a transition from the denser material to the less dense one).

@@ Line 49: / Line 49: @@
 *[[Estudos de Óptica num Prisma Semi-cilíndrico | Portuguese Version (Versão em Português)]]
 *[http://en.wikipedia.org/wiki/Poly(methyl_methacrylate) Wikipedia article about Plexiglas]
-*[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/efficacy.html | Table with the conversion factors between Lumens and Watt]
+*[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/efficacy.html Table with the conversion factors between Lumens and Watt]
-*[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/lumpow.html#c1 | Article on Hyperphysics about the relation between Lumens and Watt]
+*[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/lumpow.html#c1 Article on Hyperphysics about the relation between Lumens and Watt]

← Older revision		Revision as of 20:55, 2 June 2013
Line 49:		Line 49:
	*[[Estudos de Óptica num Prisma Semi-cilíndrico \| Portuguese Version (Versão em Português)]]		*[[Estudos de Óptica num Prisma Semi-cilíndrico \| Portuguese Version (Versão em Português)]]
	*[http://en.wikipedia.org/wiki/Poly(methyl_methacrylate) Wikipedia article about Plexiglas]		*[http://en.wikipedia.org/wiki/Poly(methyl_methacrylate) Wikipedia article about Plexiglas]
		+	*[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/efficacy.html \| Table with the conversion factors between Lumens and Watt]
		+	*[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/lumpow.html#c1 \| Article on Hyperphysics about the relation between Lumens and Watt]

@@ Line 48: / Line 48: @@
 =Links=
 *[[Estudos de Óptica num Prisma Semi-cilíndrico | Portuguese Version (Versão em Português)]]
-*[[http://en.wikipedia.org/wiki/Poly(methyl_methacrylate) | Wikipedia article about Plexiglas]]
+*[http://en.wikipedia.org/wiki/Poly(methyl_methacrylate) Wikipedia article about Plexiglas]

@@ Line 24: / Line 24: @@
 ==Protocol I==
-The ray tracer mode allows a qualitative analysis of the transmission and reflection of light in the inerface between plexiglass and air through the pictures captured by the camera.
+The ray tracer mode allows a qualitative analysis of the transmission and reflection of light in the interface between plexiglass and air through the pictures captured by the camera.
 The user chooses the starting and ending angle for the sweep. With some pictures and Snell's law it is possible to calculate the refraction index for the denser material (plexiglass). We suggest using an image processing software like Corelpaint, Photoshop or Draw (openoffice.org) to analyse the pictures: simply find the light rays and measure the angle between them.
-Note: selecting angles between 0º and 180º means the light will shine upon the curved side of the semi-cilinder, whereas between 180º and 360º the light will shine on the straight side.
+Note: selecting angles between 0º and 180º means the light will shine upon the curved side of the semi-cylinder, whereas between 180º and 360º the light will shine on the straight side.
 ==Protocol II==

@@ Line 32: / Line 32: @@
 ==Protocol II==
-In "direct light" mode, the user selects the angle at which light shines upon the cilinder, and during the experiment itself the output will the laser's intensity. There are usually two maxima by sweeping the circle: one is the transmited ray and the other the reflected.
+In "direct light" mode, the user selects the angle at which light shines upon the cylinder, and during the experiment itself the output will the laser's intensity. There are usually two maxima by sweeping the circle: one is the transmitted ray and the other the reflected.
-At 0º, the user can determine the laser's absolute power. We also suggest anlges in [90º:180º] to study the plexiglass-air interface and [270º-360º] for air-plexiglass interface.
+At 0º, the user can determine the laser's absolute power. We also suggest angles in [90º:180º] to study the plexiglass-air interface and [270º-360º] for air-plexiglass interface.
 This procedure can be done with; (i) non-polarized light, (ii) vertically polarized light, (iii) horizontally polarized light.

← Older revision		Revision as of 23:20, 27 May 2012
Line 8:		Line 8:
	This analisis can be done qualitatively by processing the picture from the camera or quantitatively by using the light sensor that sweeps the semicilinder angle-wise. Because of experimental constraints, the avaliable angle range is only 0º through 240º.		This analisis can be done qualitatively by processing the picture from the camera or quantitatively by using the light sensor that sweeps the semicilinder angle-wise. Because of experimental constraints, the avaliable angle range is only 0º through 240º.

		+
		+	<div class="toccolours mw-collapsible mw-collapsed" style="width:300px">
		+	'''Links'''
		+	<div class="mw-collapsible-content">
		+
		+	*Video: rtsp://elabmc.ist.utl.pt/optica.sdp
		+	*Laboratory: Intermediate at e-lab.ist.eu[http://e-lab.ist.eu]
		+	*Control room: optica
		+	Level: ***
		+
		+	</div>
		+	</div>

	=Experimental Protocol=		=Experimental Protocol=