76 lines
1.6 KiB
Python
76 lines
1.6 KiB
Python
import math
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# R & G values taken from images
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# white_hot = (255, 255)
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# hi = (168, 55)
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# med = (146, 26)
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# low = (25, 4)
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# custom = (156, 20)
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# firebrand_test
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rg_values = [
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(219, 7),
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(227, 14),
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(166, 14),
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]
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# Settings
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I_Darkcurrent = 7.7
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exposure_time = 0.500
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f_stop = 2.4
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ISO = 100 # basically brightness
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def pyrometry_calibration_formula(i_ng, i_nr):
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"""
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Given the green-red ratio, calculates an approximate temperature
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in Celsius.
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"""
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try:
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return (
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362.73 * math.log10(i_ng/i_nr) ** 3 +
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2186.7 * math.log10(i_ng/i_nr) ** 2 +
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4466.5 * math.log10(i_ng / i_nr) +
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3753.5
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)
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# return 362.73 * math.log10(
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# (i_ng/i_nr) ** 3
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# ) + 2186.7 * math.log10(
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# (i_ng/i_nr) ** 2
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# ) + 4466.5 * math.log10(
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# (i_ng / i_nr)
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# ) + 3753.5
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except:
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return 'dropped'
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def tprint(*items):
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for item in items:
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print(item, end="\t")
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print()
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def grtemp(px):
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r_norm = (px[0] - I_Darkcurrent) * (f_stop ** 2) / (ISO * exposure_time)
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g_norm = (px[1] - I_Darkcurrent) * (f_stop ** 2) / (ISO * exposure_time)
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res = pyrometry_calibration_formula(g_norm, r_norm)
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tprint(
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px[0],
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px[1],
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round(px[0] / px[1], 2),
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round(r_norm, 2),
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round(g_norm, 2),
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round(g_norm / r_norm, 4),
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res,
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)
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tprint('RED', 'GREEN', 'RATIO', 'RNORM', 'GNORM', 'NRATIO', 'RES TEMP')
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for val in rg_values:
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grtemp(val)
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# grtemp(white_hot)
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# grtemp(hi)
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# grtemp(med)
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# grtemp(low)
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# grtemp(custom)
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