Exotech Radiometer - Calibration

Calibration Introduction

Measurements from the Exotech are in voltages for each channel. If the intended results from a research question is reflectance factors and the same instrument is used to measure the reflected and incoming radiant energy components the units of volts would be acceptable. However, if different instruments are used or the research question is to find the actual amount of energy that is being measured, the Exotech must be calibrated and data converted to units such as Watts per square meter (per steradian).

Currently, calibrations are completed by the manufacturer.

Current Calibrations

Model 100 BX SN 3577 March 6, 2000		Field of View	1 Degree				15 Degree				2 p Steradians
		Gain Setting	1	5	25	125	1	5	25	125	1	5	25	125
		Exponent 10ⁿ	-3	-3	-3	-6	-3	-3	-3	-6	-3	-3	-3	-6
Filters	Wavebands	Range (nm)	(Radiance) W cm ^-2 sr ^-1 V ^-1x 10ⁿ								(Irradiance) W cm ^-2 V^-1x 10ⁿ
MSS	A	501 - 608	4	0.8	0.16	32	4.1	0.820	0.164	32.8	10.1	2.03	0.406	81.2
	B	600 - 698	4	0.8	0.16	32	4.18	0.837	0.167	33.5	8.09	1.62	0.323	64.7
	C	703 - 804	4	0.8	0.16	32	4.19	0.838	0.168	33.5	8.11	1.62	0.324	64.9
	D	812 - 1025	4	0.8	0.16	32	4.25	0.849	0.17	34	7.21	1.44	0.288	57.7
TM	A	455 - 514	9.19	1.84	0.367	73.5	9.39	1.88	0.375	75.1	24.8	4.96	0.992	198
	B	528 - 597	5.98	1.20	0.239	47.8	6.15	1.23	0.246	49.2	12.8	2.57	0.514	103
	C	629 - 689	4.62	0.924	0.185	36.9	4.72	0.944	0.189	37.8	10.5	2.1	0.421	84.1
	D	778 - 893	4.56	0.911	0.182	36.5	4.81	0.962	0.192	38.5	8.67	1.73	0.347	69.3

Model 100 A SN 3434 March 8, 2000		Field of View	1 Degree				15 Degree				2 p Steradians
		Gain Setting	1	5	25	125	1	5	25	125	1	5	25	125
		Exponent 10ⁿ	-3	-3	-3	-6	-3	-3	-3	-6	-3	-3	-3	-6
Filters	Wavebands	Range (mm)	(Radiance) W cm ^-2 sr ^-1 V ^-1x 10ⁿ								(Irradiance) W cm ^-2 V ^-1x 10ⁿ
MSS	A	0.5 - 0.6	4	0.8	0.16	32	4.02	0.805	0.161	32.2	7.81	1.56	0.312	62.5
	B	0.6 - 0.7	4	0.8	0.16	32	3.95	0.791	0.158	31.6	7.77	1.55	0.311	62.2
	C	0.7 - 0.8	4	0.8	0.16	32	4	0.800	0.16	32	7.16	1.43	0.286	57.3
	D	0.8 - 1.1	4	0.8	0.16	32	3.99	0.798	0.16	31.9	7.54	1.51	0.301	60.3

Previous Calibrations

Model 100 BX SN 3577 Feb. 17, 1999		Field of View	1 Degree				15 Degree				2 p Steradians
		Gain Setting	1	5	25	125	1	5	25	125	1	5	25	125
		Exponent 10ⁿ	-3	-3	-3	-6	-3	-3	-3	-6	-3	-3	-3	-6
Filters	Wavebands	Range (nm)	(Radiance) W cm ^-2 sr ^-1 V ^-1x 10ⁿ								(Irradiance) W cm ^-2 V^-1x 10ⁿ
MSS	A	501 - 608	4	0.8	0.16	32	4.1	0.821	0.164	32.8	9.86	1.97	0.395	78.9
	B	600 - 698	4	0.8	0.16	32	4.18	0.835	0.167	33.4	8.12	1.62	0.325	65
	C	703 - 804	4	0.8	0.16	32	4.18	0.837	0.167	33.5	8.35	1.67	0.334	66.8
	D	812 - 1025	4	0.8	0.16	32	4.25	0.851	0.17	34	7.47	1.49	0.299	59.7
TM	A	455 - 514	8.91	1.78	0.357	71.3	9.1	1.82	0.364	72.8	23	4.6	0.921	184
	B	528 - 597	5.92	1.18	0.237	47.4	6.1	1.22	0.244	48.8	12.5	2.51	0.502	100
	C	629 - 689	4.61	0.922	0.184	36.9	4.71	0.941	0.188	37.7	10.5	2.1	0.419	83.8
	D	778 - 893	4.53	0.905	0.181	36.2	4.75	0.95	0.19	38	8.9	1.78	0.356	71.2

Model 100 A SN 3434 January 21, 1999		Field of View	1 Degree				15 Degree				2 p Steradians
		Gain Setting	1	5	25	125	1	5	25	125	1	5	25	125
		Exponent 10ⁿ	-3	-3	-3	-6	-3	-3	-3	-6	-3	-3	-3	-6
Filters	Wavebands	Range (nm)	(Radiance) W cm ^-2 sr ^-1 V ^-1x 10ⁿ								(Irradiance) W cm ^-2 V ^-1x 10ⁿ
MSS	A	501 - 608	4	0.8	0.16	32	4.02	0.803	0.161	32.1	7.88	1.58	0.315	63
	B	600 - 698	4	0.8	0.16	32	3.96	0.791	0.158	31.7	7.78	1.56	0.311	62.2
	C	703 - 804	4	0.8	0.16	32	4	0.801	0.16	32	7.17	1.43	0.287	57.4
	D	812 - 1025	4	0.8	0.16	32	4	0.8	0.16	32	7.56	1.51	0.302	60.5