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Added SRF calculation and display for multiloop antennas 

As above.
pull/2/head
miguel 2021-08-30 12:28:09 +10:00
rodzic 6c2a7eff29
commit 8e628e5948
1 zmienionych plików z 10 dodań i 5 usunięć
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15
magloop.html
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@ -176,9 +176,6 @@
// From Knight's 2016 paper on coil self-resonance, attributed to Wheeler's 1982 eqn as modified by Bob Weaver
var retval;
const c_spacing = 1e-3 * loop_spacing_slider.value * conductor_diameter_slider.value;
//const corr_factor = Math.sqrt(1.0 + (c_spacing**2 / loop_diameter_slider.value**2));
//const conductor_length = Math.PI * loop_diameter_slider.value * loop_turns_slider.value * corr_factor;
// const x = loop_diameter_slider.value / conductor_length;
const x = loop_diameter_slider.value / (c_spacing * loop_turns_slider.value);
const zk = 2.0 / (Math.PI * x);
const k0 = 1.0 / (Math.log(8.0 / Math.PI) - 0.5);
@ -257,7 +254,8 @@
for (i = 0; i < (proximityResistance[0].length-1); i++) {
if(spacing_ratio <= proximityResistance[0][i+1]) {
// Linear interpolation between empirical proximity resistance values:
retval = (((spacing_ratio - proximityResistance[0][i]) / (proximityResistance[0][i+1] - proximityResistance[0][i]) * (proximityResistance[n_turns][i+1] - proximityResistance[n_turns][i])) + proximityResistance[n_turns][i]);
retval = (((spacing_ratio - proximityResistance[0][i]) / (proximityResistance[0][i+1] - proximityResistance[0][i])
* (proximityResistance[n_turns][i+1] - proximityResistance[n_turns][i])) + proximityResistance[n_turns][i]);
break;
}
}
@ -272,7 +270,6 @@
const loop_spacing_ratio = loop_spacing_slider.value;
const mu0 = 4.0 * Math.PI * 1e-7;
const k = (n_turns * a_coil_radius / b_conductor_radius);
//const cu_sigma = 58e6; // Copper conductance value 58e6; Aluminium 35e6;
const Rp = getProximityResFromSpacing(loop_spacing_ratio);
const Rs = Math.sqrt(Math.PI * frequency * mu0 / conductivity);
const R0 = (n_turns * Rs) / (2.0 * Math.PI * b_conductor_radius);
@ -360,6 +357,12 @@
});
return retval;
}
function calculateSRF() {
const capacitance = (loop_turns_slider.value > 1) ? multiloopCapacitance() : 1e-12;
const inductance = getInductance();
return (1.0 / (2.0 * Math.PI * ((inductance * capacitance) ** 0.5)));
}
metric_radio.oninput = function() {
units = metric_radio.value;
@ -694,10 +697,12 @@
sctx.font = "12px arial";
if(loop_turns_slider.value > 1) {
const L = multiloopCapacitance() * 1e+12;
const srf = calculateSRF();
sctx.textAlign = "right";
sctx.fillText("C = " + L.toFixed(0).toString() + " pF", win_width-8, 18);
sctx.textAlign = "left";
sctx.fillText("N = " + loop_turns_slider.value.toString(), 8, win_height * 0.1 + 3);
sctx.fillText("SRF = " + (srf*1e-6).toPrecision(3).toString() + " MHz", 8, dim_y + 20);
} else {
// Draw turns number text:
//sctx.font = "12px arial";