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V10 added skin depth

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miguel 2023-05-08 12:02:12 +10:00
rodzic 67577c8836
commit 6e82732cec
1 zmienionych plików z 57 dodań i 3 usunięć
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magloop.html
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@ -7,7 +7,7 @@
<link rel="stylesheet" href="magloop.css"> <link rel="stylesheet" href="magloop.css">
</head> </head>
<body> <body>
<header>Miguel <a href="mailto:vk3cpu@gmail.com">VK3CPU</a> - Magloop Antenna Calculator V9</header> <header>Miguel <a href="mailto:vk3cpu@gmail.com">VK3CPU</a> - Magloop Antenna Calculator V10</header>
<section class="gridLayoutClass"> <section class="gridLayoutClass">
<div class="chart-container" style="position: relative;"> <div class="chart-container" style="position: relative;">
<canvas id="chartCanvas" class="chartCanvasClass"> <canvas id="chartCanvas" class="chartCanvasClass">
@ -116,6 +116,7 @@
<li>Q : The antenna Q (quality) factor.</li> <li>Q : The antenna Q (quality) factor.</li>
<li>Ia (A): The RMS loop current in amps.</li> <li>Ia (A): The RMS loop current in amps.</li>
<li>Perimeter (&#955): Antenna perimeter size relative to the wavelength.</li> <li>Perimeter (&#955): Antenna perimeter size relative to the wavelength.</li>
<li>Skin depth (&#956m): Conductor skin depth in micrometers.</li>
</ul> </ul>
<u><b>Usage hints:</b></u> <u><b>Usage hints:</b></u>
<li>Tap on legend items to disable or enable an output parameter. This can be used to declutter the chart.</li> <li>Tap on legend items to disable or enable an output parameter. This can be used to declutter the chart.</li>
@ -134,6 +135,8 @@
[2]: A. Boswell, A. J. Tyler and A. White, <b>"Performance of a Small Loop Antenna in the 3 - 10 MHz Band"</b> <i>, IEEE Antennas and Propagation Magazine, 47, 2, April 2005, pp. 5 1 -56.</i> <br> [2]: A. Boswell, A. J. Tyler and A. White, <b>"Performance of a Small Loop Antenna in the 3 - 10 MHz Band"</b> <i>, IEEE Antennas and Propagation Magazine, 47, 2, April 2005, pp. 5 1 -56.</i> <br>
<br> <br>
<b><u>Change history:</u></b><br> <b><u>Change history:</u></b><br>
<b>[8-May-23] - V10</b> <br>
* Added conductor skin depth as a new calculated parameter.<br>
<b>[23-Apr-23] - V9</b> <br> <b>[23-Apr-23] - V9</b> <br>
* Changed the frequency list to include VHF (2m) and UHF (70cm) bands.<br> * Changed the frequency list to include VHF (2m) and UHF (70cm) bands.<br>
* Reduced minimum loop diameter to 4 cm.<br> * Reduced minimum loop diameter to 4 cm.<br>
@ -208,6 +211,7 @@
var shape = "circle"; // Shape of the main loop var shape = "circle"; // Shape of the main loop
var loop_turns = 1; // var loop_turns = 1; //
var loop_mode = "series"; // Series or parallel. When loop_turns_slider.value == 0, loop_turns is 2 and loop_mode is "parallel" var loop_mode = "series"; // Series or parallel. When loop_turns_slider.value == 0, loop_turns is 2 and loop_mode is "parallel"
const mu0 = Math.PI * 4e-7;
var inductance = 0.0; var inductance = 0.0;
var area = 0.0; // Loop area in square meters. var area = 0.0; // Loop area in square meters.
@ -309,7 +313,6 @@
// Calculate the inductance of the coil. For single turn loops, use standard inductance equation. For multi-turn, use Nagaoka correction. // Calculate the inductance of the coil. For single turn loops, use standard inductance equation. For multi-turn, use Nagaoka correction.
function getInductance() { function getInductance() {
const mu0 = Math.PI * 4e-7;
const loop_diameter_meters = loop_diameter_slider.value; const loop_diameter_meters = loop_diameter_slider.value;
const cond_diameter_meters = conductor_diameter_slider.value * 1e-3; const cond_diameter_meters = conductor_diameter_slider.value * 1e-3;
const spacing_ratio = loop_spacing_slider.value; const spacing_ratio = loop_spacing_slider.value;
@ -480,7 +483,6 @@
const a_coil_radius = loop_diameter_slider.value * 0.5; const a_coil_radius = loop_diameter_slider.value * 0.5;
const b_conductor_radius = conductor_diameter_slider.value * 0.0005; const b_conductor_radius = conductor_diameter_slider.value * 0.0005;
const loop_spacing_ratio = loop_spacing_slider.value; const loop_spacing_ratio = loop_spacing_slider.value;
const mu0 = 4.0 * Math.PI * 1e-7;
// How much longer is the perimeter compared to the circumference if it were circular: // How much longer is the perimeter compared to the circumference if it were circular:
const shape_factor = perimeter / (Math.PI * loop_diameter_slider.value); const shape_factor = perimeter / (Math.PI * loop_diameter_slider.value);
@ -505,6 +507,16 @@
}); });
return retval; return retval;
} }
// Returns skin-depth in micrometers:
function calculateSkinDepth() {
var retval = [];
frequencies.forEach(freq => {
const skin_depth = 1e6 * Math.sqrt(1e-6/(conductivity * Math.PI * freq * mu0));
retval.push({x:freq, y:skin_depth});
});
return retval;
}
function calculateEfficiencyFactor() { function calculateEfficiencyFactor() {
var retval = []; var retval = [];
@ -626,6 +638,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -646,6 +659,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -665,6 +679,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -684,6 +699,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -703,6 +719,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -722,6 +739,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -770,6 +788,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -809,6 +828,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -846,6 +866,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -885,6 +906,7 @@
myChart.data.datasets[7].data = calculateQualityFactor(); myChart.data.datasets[7].data = calculateQualityFactor();
myChart.data.datasets[8].data = calculateCirculatingCurrent(); myChart.data.datasets[8].data = calculateCirculatingCurrent();
myChart.data.datasets[9].data = calculateAntennaSize(); myChart.data.datasets[9].data = calculateAntennaSize();
myChart.data.datasets[10].data = calculateSkinDepth();
myChart.update(); myChart.update();
} }
@ -1611,6 +1633,16 @@
borderWidth: 1, borderWidth: 1,
yAxisID: 'sizeID', yAxisID: 'sizeID',
tension: 0.3, tension: 0.3,
},
{
label: 'Skin depth (\u03BCm)',
fill: false,
borderColor: 'rgb(75,75,75)',
backgroundColor: 'rgb(75,75,75)',
data: calculateSkinDepth(),
borderWidth: 1,
yAxisID: 'skinID',
tension: 0.3,
}] }]
}, },
options: { options: {
@ -1781,6 +1813,24 @@
}, },
min: 0.0, min: 0.0,
position: 'right', position: 'right',
},
'skinID' : {
type: 'linear',
display: 'auto',
title: {
display: true,
text: '\u03B4 (\u03BCm)',
color: 'rgb(90,90,90)',
font: {
weight : 'bold'
}
},
ticks: {
beginAtZero: true,
//max: 0.3,
},
min: 0.0,
position: 'right',
} }
}, },
plugins: { plugins: {
@ -1848,6 +1898,10 @@
} else } else
if(label[0] == 'P'){ if(label[0] == 'P'){
label = justifyText("Perimeter: ", value.toFixed(3).toString() + ' ' + '\u03BB'); label = justifyText("Perimeter: ", value.toFixed(3).toString() + ' ' + '\u03BB');
} else
if(label[0] == 'S'){
var num = getMetricPrefix(value * 1e-6);
label = justifyText("Skin depth: ", num.val.toPrecision(3).toString() + ' ' + num.pfx + 'm');
} else { } else {
label += value.toFixed(3).toString(); label += value.toFixed(3).toString();
} }