/
charting.php
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/
charting.php
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<?php
include_once('conn.php');
function refractionIndex($lambda, $a, $b, $c, $d, $e) {
return sqrt($a + $b*pow($lambda,2)/(pow($lambda,2) - $c) + $d*pow($lambda,2)/(pow($lambda,2) - $e));
}
function sellmeierCoeffs($cat_names, $mysqli) {
// Set up array for saving data
$materials = array();
foreach($cat_names as $name) {
$materials[$name] = array(
'a' => 0,
'b' => 0,
'c' => 0,
'd' => 0,
'e' => 0
);
}
// SQL calls
foreach ($materials as $cat_name => $value) {
$q = 'SELECT a_sell,b_sell,c_sell,d_sell,e_sell FROM sellmeir WHERE cat_name="'.$cat_name.'" LIMIT 1';
$result = $mysqli->query($q);
$row = $result->fetch_assoc();
$materials[$cat_name]['a'] = $row['a_sell'];
$materials[$cat_name]['b'] = $row['b_sell'];
$materials[$cat_name]['c'] = $row['c_sell'];
$materials[$cat_name]['d'] = $row['d_sell'];
$materials[$cat_name]['e'] = $row['e_sell'];
}
return $materials;
}
// Materials to analyze
$cat_names = array('Al2O3', 'BaY2F8', 'LaCl3');
// Wavelength range in micrometers
$lambda_min = .2;
$d_lambda = .01;
$lambda_max = 1;
$lambdas = range($lambda_min, $lambda_max, $d_lambda);
$materials = sellmeierCoeffs($cat_names, $mysqli);
$refractions = array();
foreach($materials as $name => $coeffs) {
$refractions[$name] = array();
foreach($lambdas as $lambda) {
$refractions[$name][] = refractionIndex($lambda,
$coeffs['a'],
$coeffs['b'],
$coeffs['c'],
$coeffs['d'],
$coeffs['e']
);
}
}
$output = array();
$output[] = array_merge(array('Wavelength'), $cat_names);
foreach($lambdas as $key => $lambda) {
$row = array($lambda);
foreach($cat_names as $name) {
$row[] = $refractions[$name][$key];
}
$output[] = $row;
}
echo json_encode($output);
?>