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# Copyright (c) 2017 Weitian LI <liweitianux@live.com>
# MIT license
"""
Chandra ACIS utilities
"""
import math
class ACIS:
"""
Chandra ACIS detector properties and utilities.
References
----------
[1] CIAO - dictionary - ACIS (advanced camera for imaging and spectroscopy)
http://cxc.harvard.edu/ciao/dictionary/acis.html
[2] CIAO - Dictionary - PI (pulse invariant)
http://cxc.harvard.edu/ciao/dictionary/pi.html
"""
# Pixel size
pixel2arcsec = 0.492 # [arcsec]
# Number of channels
nchannel = 1024
# Channel energy width
echannel = 14.6 # [eV]
@classmethod
def energy2channel(self, energy):
"""
Convert energy [eV] to channel number.
"""
return math.floor(energy/self.echannel + 1)
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