emcal

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Contents: Description, Arguments, Usage, Examples, Images, Sub-Functions, Related Functions, Source

Description

emcal() - Emissivity Calculation of Laboratory Spectra at ASU

Computes an instrument response function from measured emission, spectra of hot and warm blackbody and known blackbody temperatures. Then calculates emissivity using previously calculated response function, hot bb spectrum, hot sample spectrum, and known environment temperature.

Arguments and Return Values

Arguments: A directory containing spectra files (*.CSV), bbhot.CSV and bbwarm.CSV

Return Value: Writes either a single .hdf file or if indi is selected individual .txt files to be used with readvm

Usage

Syntax: emcal(dir=STRING, hotbbT=FLOAT, warmbbT=FLOAT, filename=STRING [,indiv="yes/no"] [,bbhot=STRING] [,bbwarm=STRING] [,dehyd="yes/no"] [,libspec="yes/no"] [,field_spec="yes/no"] [,resample="yes/no"] [,ratw="yes/no"] [,cold="yes/no"] [,temp=VAL] [,wn=VAL])

'dir' - A string defining the directory containing appropriate spectra

'hotbbT' - Temperature of hot blackbody

'warmbbT' - Temperature of the warm blackbody

'filename' - A string containing the desired name of the output file

'resample' - resample spectra to the response function xaxis

'bbhot' - hot black body filename (Default="bbhot.CSV")

'bbwarm' - warm black body filename (Default="bbwarm.CSV")

'dehyd' - add dehydrated spectra to the output structure (Uses dehyd2())

'indiv' - write spectra as individual text files

'libspec' - prompt for input data for ASU spectral library uploads

'field_spec' - calibrate D & P spectra

'ratw' - calibrate spectra using a "Rock Around the World" standard procedure

'cold' - calibrate spectra which have been measured colder than the chamber temperature

'temp'- prompt for temperature when sample temperature is known in degrees C

'wn' -prompt for wavenumber for sample determination

Examples

dv> out=emcal(".",100.114,71.15,"output.hdf")

Displaying Response Function; Press "Enter" to continue

Instrument T is: 27.99
Sample T for "silica5_oliv_pel" is: 93.52
Sample T for sample "silica5_oliv_pel" is determined at: 1205.31
What is the chamber T for "silica5_oliv_pel"?
24.5

Instrument T is: 27.99
Sample T for "silica5_oliv_aug_pel" is: 94.64
Sample T for sample "silica5_oliv_aug_pel" is determined at: 1205.31
What is the chamber T for "silica5_oliv_aug_pel"?
22.35

Continue through all spectra.

Instrument T is: 27.99
Sample T for "bbh_01.04.08" is: 100.26
Sample T for sample "bbh_01.04.08" is determined at: 345.20
What is the chamber T for "bbh_01.04.08"?
22.85

struct, 13 elements
   xaxis: 1x1x934 array of float, bsq format [3,736 bytes]
   hbb: 1x1x934 array of float, bsq format [3,736 bytes]
   hotbb_temperature: 100.1139984
   wbb: 1x1x934 array of float, bsq format [3,736 bytes]
   warmbb_temperature: 71.15000153
   response: 1x1x934 array of float, bsq format [3,736 bytes]
   raw: 1x21x934 array of float, bsq format [78,456 bytes]
   sample_name: Text Buffer with 21 lines of text
       1: silica5_oliv_pel
       2: silica5_oliv_aug_pel
       3: silica5_oliv_and_pel
       4: silica2.5_oliv_pel
       5: silica2.5_oliv_aug_pel
       6: silica2.5_oliv_and_pel
       7: silica10_oliv_pel
       8: silica10_oliv_aug_pel
       9: silica10_oliv_and_pel
       10: olivine_76-105_pellet
   sample_temperature: Text Buffer with 21 lines of text
       1: 93.52
       2: 94.64
       3: 79.59
       4: 78.35
       5: 91.37
       6: 88.21
       7: 94.78
       8: 83.86
       9: 82.48
       10: 75.66
   chamber_temperature: Text Buffer with 21 lines of text
       1: 24.5
       2: 22.35
       3: 22.22
       4: 22.45
       5: 23.45
       6: 24.66
       7: 23.54
       8: 23.66
       9: 24.22
       10:22.54
   radiance: 1x21x934 array of float, bsq format [78,456 bytes]
   btemp: 1x21x934 array of float, bsq format [78,456 bytes]
   data: 1x21x934 array of float, bsq format [78,456 bytes]
dv>

Images

The left spectrum is an example response function while the right spectrum is an example emissivity spectrum.