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| 50 | <h1>Source code for sas.calculator.kiessig_calculator</h1><div class="highlight"><pre> |
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| 51 | <span class="sd">"""</span> |
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| 52 | <span class="sd">This module is a small tool to allow user to quickly</span> |
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| 53 | <span class="sd">determine the size value in real space from the</span> |
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| 54 | <span class="sd">fringe width in q space.</span> |
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| 55 | <span class="sd">"""</span> |
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| 56 | <span class="kn">from</span> <span class="nn">math</span> <span class="kn">import</span> <span class="n">pi</span><span class="p">,</span> <span class="n">fabs</span> |
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| 57 | <span class="n">_DQ_DEFAULT</span> <span class="o">=</span> <span class="mf">0.05</span> |
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| 58 | |
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| 59 | |
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| 60 | <div class="viewcode-block" id="KiessigThicknessCalculator"><a class="viewcode-back" href="../../../dev/api/sas.calculator.html#sas.calculator.kiessig_calculator.KiessigThicknessCalculator">[docs]</a><span class="k">class</span> <span class="nc">KiessigThicknessCalculator</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
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| 61 | <span class="sd">"""</span> |
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| 62 | <span class="sd"> compute thickness from the fringe width of data</span> |
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| 63 | <span class="sd"> """</span> |
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| 64 | <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
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| 65 | |
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| 66 | <span class="c"># dq value</span> |
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| 67 | <span class="bp">self</span><span class="o">.</span><span class="n">deltaq</span> <span class="o">=</span> <span class="n">_DQ_DEFAULT</span> |
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| 68 | <span class="c"># thickenss value</span> |
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| 69 | <span class="bp">self</span><span class="o">.</span><span class="n">thickness</span> <span class="o">=</span> <span class="bp">None</span> |
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| 70 | <span class="c"># unit of the thickness</span> |
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| 71 | <span class="bp">self</span><span class="o">.</span><span class="n">thickness_unit</span> <span class="o">=</span> <span class="s">'A'</span> |
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| 72 | |
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| 73 | <div class="viewcode-block" id="KiessigThicknessCalculator.set_deltaq"><a class="viewcode-back" href="../../../dev/api/sas.calculator.html#sas.calculator.kiessig_calculator.KiessigThicknessCalculator.set_deltaq">[docs]</a> <span class="k">def</span> <span class="nf">set_deltaq</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dq</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span> |
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| 74 | <span class="sd">"""</span> |
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| 75 | <span class="sd"> Receive deltaQ value</span> |
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| 76 | <span class="sd"> </span> |
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| 77 | <span class="sd"> :param dq: q fringe width in 1/A unit</span> |
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| 78 | <span class="sd"> """</span> |
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| 79 | <span class="c"># set dq</span> |
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| 80 | <span class="bp">self</span><span class="o">.</span><span class="n">deltaq</span> <span class="o">=</span> <span class="n">dq</span> |
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| 81 | </div> |
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| 82 | <div class="viewcode-block" id="KiessigThicknessCalculator.get_deltaq"><a class="viewcode-back" href="../../../dev/api/sas.calculator.html#sas.calculator.kiessig_calculator.KiessigThicknessCalculator.get_deltaq">[docs]</a> <span class="k">def</span> <span class="nf">get_deltaq</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
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| 83 | <span class="sd">"""</span> |
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| 84 | <span class="sd"> return deltaQ value in 1/A unit</span> |
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| 85 | <span class="sd"> """</span> |
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| 86 | <span class="c"># return dq</span> |
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| 87 | <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">deltaq</span> |
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| 88 | </div> |
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| 89 | <div class="viewcode-block" id="KiessigThicknessCalculator.compute_thickness"><a class="viewcode-back" href="../../../dev/api/sas.calculator.html#sas.calculator.kiessig_calculator.KiessigThicknessCalculator.compute_thickness">[docs]</a> <span class="k">def</span> <span class="nf">compute_thickness</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
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| 90 | <span class="sd">"""</span> |
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| 91 | <span class="sd"> Calculate thickness.</span> |
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| 92 | <span class="sd"> </span> |
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| 93 | <span class="sd"> :return: the thickness.</span> |
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| 94 | <span class="sd"> """</span> |
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| 95 | <span class="c"># check if it is float</span> |
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| 96 | <span class="k">try</span><span class="p">:</span> |
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| 97 | <span class="n">dq</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">deltaq</span><span class="p">)</span> |
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| 98 | <span class="k">except</span><span class="p">:</span> |
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| 99 | <span class="k">return</span> <span class="bp">None</span> |
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| 100 | <span class="c"># check if delta_q is zero</span> |
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| 101 | <span class="k">if</span> <span class="n">dq</span> <span class="o">==</span> <span class="mf">0.0</span> <span class="ow">or</span> <span class="n">dq</span> <span class="o">==</span> <span class="bp">None</span><span class="p">:</span> |
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| 102 | <span class="k">return</span> <span class="bp">None</span> |
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| 103 | <span class="k">else</span><span class="p">:</span> |
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| 104 | <span class="c"># calculate thickness</span> |
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| 105 | <span class="n">thickness</span> <span class="o">=</span> <span class="mi">2</span><span class="o">*</span><span class="n">pi</span><span class="o">/</span><span class="n">fabs</span><span class="p">(</span><span class="n">dq</span><span class="p">)</span> |
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| 106 | <span class="c"># return thickness value</span> |
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| 107 | <span class="k">return</span> <span class="n">thickness</span> |
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| 108 | </div> |
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| 109 | <div class="viewcode-block" id="KiessigThicknessCalculator.get_thickness_unit"><a class="viewcode-back" href="../../../dev/api/sas.calculator.html#sas.calculator.kiessig_calculator.KiessigThicknessCalculator.get_thickness_unit">[docs]</a> <span class="k">def</span> <span class="nf">get_thickness_unit</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
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| 110 | <span class="sd">"""</span> |
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| 111 | <span class="sd"> :return: the thickness unit.</span> |
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| 112 | <span class="sd"> """</span> |
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| 113 | <span class="c"># unit of thickness</span> |
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| 114 | <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">thickness_unit</span></div></div> |
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