Operation and investigation of a tilted bottom cavity for pyrgeometer characterizations

Julian Gröbner

doi:10.1364/AO.47.004441

Applied Optics
Vol. 47,
Issue 24,
pp. 4441-4447
(2008)
•https://doi.org/10.1364/AO.47.004441

Operation and investigation of a tilted bottom cavity for pyrgeometer characterizations

Julian Gröbner

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Julian Gröbner, "Operation and investigation of a tilted bottom cavity for pyrgeometer characterizations," Appl. Opt. 47, 4441-4447 (2008)

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Abstract

A new cavity for pyrgeometer characterizations has been built at the Infrared Radiometry Section of the World Radiation Center (WRC-IRS) at PMOD/WRC. The calculated effective emissivity of $0.99993 \pm 0.00033$ was obtained from Monte Carlo simulations taking into account the geometry and the measured temperature distributions of the cavity. The cavity is operated in a temperature range of $- 30 ° C$ to $+ 30 ° C$ and is initially flushed with nitrogen to reduce the relative humidity in the cavity. The estimated uncertainties of retrieved pyrgeometer parameters $k_{1}$ , $k_{2}$ , and $k_{3}$ are $\pm 0.024$ , $\pm 0.0008$ , and $\pm 0.03$ , respectively. The relative uncertainty of pyrgeometer sensitivity C is 0.8%. The comparison with the cavity used since 1995 at PMOD/WRC gave average differences of 0.005, 0.00026, and 0.08 for $k_{1}$ , $k_{2}$ , and $k_{3}$ , respectively. The pyrgeometer sensitivity retrieved with the new cavity is on average 1.0% higher than with the original cavity.

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Equations (4)

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$T_{Ref}$	$T_{R}$		E	$E_{Ref}$	$E - E_{Ref}$
[K]	[K]	$ϵ_{e}$	[ $W m^{- 2}$ ]	[ $W m^{- 2}$ ]	[ $W m^{- 2}$ ]
288.06	288.03	0.999578	390.28	390.40	$- 0.12$
283.20	283.19	0.999801	364.69	364.72	$- 0.03$
273.42	273.42	0.999956	316.91	316.89	$+ 0.02$
263.68	263.68	1.000012	274.09	274.09	0.00
254.03	254.05	1.000230	236.20	236.11	$+ 0.09$
244.39	244.39	1.000000	202.29	202.26	$+ 0.03$

Parameter		Relative
Type	Uncertainty	Uncertainty in C [%]
U	$0.1 μV$	0.06
E	$0.18 {Wm}^{- 2}$	0.5
$k_{1}$	0.024	0.4
$k_{2}$	0.0008	0.3
$k_{3}$	0.03	0.0
$T_{b}$	$0.003 K$	0.2
$T_{d}$	$0.003 K$	0.1
Residuals	$0.12 {Wm}^{- 2}$	0.3
Total		0.8

Pyrgeometer ID	$C [μ {VW}^{- 1} m^{2}]$	$k_{1}$	$k_{2}$	$k_{3}$	Cavity	$C_{BB 2007}^{*} / C_{BB 1995} - 1 [%]$
PIR 31463F3	3.62	0.047	0.9956	3.14	BB1995
	3.48	0.007	0.9943	3.34	BB2007	0.9
PIR 31464F3	3.81	0.015	0.9956	2.72	BB1995
	3.66	$- 0.028$	0.9943	2.81	BB2007	0.6
PIR 3055xF3	4.22	$- 0.008$	0.9988	2.48	BB1995
	4.34	0.011	0.9990	2.71	BB2007	1.3
PIR 3119xF3	4.14	0.054	1.0024	2.54	BB1995
	4.23	0.063	1.0027	2.62	BB2007	1.4
PIR 3400xF3	3.68	0.061	0.9989	3.34	BB1995
	3.71	0.064	0.9998	3.22	BB2007	0.4
PIR 3400yF3	3.67	0.011	1.0012	2.85	BB1995
	3.76	0.030	1.0015	2.84	BB2007	0.3
CG4 FT004	11.5	$- 0.059$	0.9970	-	BB1995
	11.9	$- 0.034$	0.9977	-	BB2007	1.0
CG4 010535	8.87	$- 0.029$	0.9978	-	BB1995
	8.93	$- 0.029$	0.9984	-	BB2007	0.7
CG4 FT006	11.7	0.088	0.9996	-	BB1995
	11.8	0.096	1.0003	-	BB2007	0.6
CG4 0105x	9.41	$- 0.019$	1.0003	-	BB1995
	9.91	0.016	1.0012	-	BB2007	1.6
CG4 0508x	10.6	0.043	0.9958	-	BB1995
	11.0	0.063	0.9966	-	BB2007	2.3
Min Difference		$- 0.049$	$- 0.0013$	-0.12		0.3
Max Difference		0.035	0.0009	0.23		2.3
Mean Difference		0.005	0.00026	0.08		1.0

$T_{Ref}$	$T_{R}$		E	$E_{Ref}$	$E - E_{Ref}$
[K]	[K]	$ϵ_{e}$	[ $W m^{- 2}$ ]	[ $W m^{- 2}$ ]	[ $W m^{- 2}$ ]
288.06	288.03	0.999578	390.28	390.40	$- 0.12$
283.20	283.19	0.999801	364.69	364.72	$- 0.03$
273.42	273.42	0.999956	316.91	316.89	$+ 0.02$
263.68	263.68	1.000012	274.09	274.09	0.00
254.03	254.05	1.000230	236.20	236.11	$+ 0.09$
244.39	244.39	1.000000	202.29	202.26	$+ 0.03$

Parameter		Relative
Type	Uncertainty	Uncertainty in C [%]
U	$0.1 μV$	0.06
E	$0.18 {Wm}^{- 2}$	0.5
$k_{1}$	0.024	0.4
$k_{2}$	0.0008	0.3
$k_{3}$	0.03	0.0
$T_{b}$	$0.003 K$	0.2
$T_{d}$	$0.003 K$	0.1
Residuals	$0.12 {Wm}^{- 2}$	0.3
Total		0.8

Abstract

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Tables (3)

Equations (4)

Applied Optics