Development and accuracy of a multipoint method for measuring visibility

Hongda Tai; Zibo Zhuang; Dongsong Sun

doi:10.1364/AO.56.007952

Applied Optics
Vol. 56,
Issue 28,
pp. 7952-7959
(2017)
•https://doi.org/10.1364/AO.56.007952

Development and accuracy of a multipoint method for measuring visibility

Hongda Tai, Zibo Zhuang, and Dongsong Sun

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Hongda Tai, Zibo Zhuang, and Dongsong Sun, "Development and accuracy of a multipoint method for measuring visibility," Appl. Opt. 56, 7952-7959 (2017)

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Abstract

Accurate measurements of visibility are of great importance in many fields. This paper reports a multipoint visibility measurement (MVM) method to measure and calculate the atmospheric transmittance, extinction coefficient, and meteorological optical range (MOR). The relative errors of atmospheric transmittance and MOR measured by the MVM method and traditional transmissometer method are analyzed and compared. Experiments were conducted indoors, and the data were simultaneously processed. The results revealed that the MVM can effectively improve the accuracy under different visibility conditions. The greatest improvement of accuracy was 27%. The MVM can be used to calibrate and evaluate visibility meters.

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Equations (38)

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Major Components	Parameters
Laser	Wavelength	$532 \pm 1 nm$
	Beam divergence	$< 1.2 mrad$
	Power stability	$< 1 %$
	Beam diameter	$\sim 2 mm$
Chopper	Chopping frequency	20–1 kHz
	Leaf blade groove angle	18°
	Data bits	8
Lock-in amplifier	Full range sensitivity	1 nV–1 V
Lock-in amplifier	Input signal frequency range	1 mHz–100 kHz
Photoelectric detector	Wavelength coverage	350–1100 nm
Photoelectric detector	Output voltage	0–10 V

MOR (m)	50	100	200	300	400	500	600	700	800	900	1000
Relative error of transmissometer (%)	0.33	0.67	1.33	2	2.67	3.33	4	4.67	5.33	6	6.67
Relative error of MVMS (%)	0.40	0.59	0.76	0.83	0.87	0.89	0.91	0.92	0.93	0.94	0.94
MOR (m)	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2500
Relative error of transmissometer (%)	7.33	8	8.67	9.33	10	10.67	11.33	12	12.67	13.33	16.67
Relative error of MVMS (%)	0.95	0.95	0.96	0.96	0.96	0.96	0.97	0.97	0.97	0.97	0.98
MOR (m)	3000	3500	4000	4500	5000	6000	9000	10000
Relative error of transmissometer (%)	20	23.33	26.67	30	33.33	40	60	66.67
Relative error of MVMS (%)	0.98	0.98	0.98	0.99	0.99	0.99	0.99	0.99

Major Components	Parameters
Laser	Wavelength	$532 \pm 1 nm$
	Beam divergence	$< 1.2 mrad$
	Power stability	$< 1 %$
	Beam diameter	$\sim 2 mm$
Chopper	Chopping frequency	20–1 kHz
	Leaf blade groove angle	18°
	Data bits	8
Lock-in amplifier	Full range sensitivity	1 nV–1 V
Lock-in amplifier	Input signal frequency range	1 mHz–100 kHz
Photoelectric detector	Wavelength coverage	350–1100 nm
Photoelectric detector	Output voltage	0–10 V

MOR (m)	50	100	200	300	400	500	600	700	800	900	1000
Relative error of transmissometer (%)	0.33	0.67	1.33	2	2.67	3.33	4	4.67	5.33	6	6.67
Relative error of MVMS (%)	0.40	0.59	0.76	0.83	0.87	0.89	0.91	0.92	0.93	0.94	0.94
MOR (m)	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2500
Relative error of transmissometer (%)	7.33	8	8.67	9.33	10	10.67	11.33	12	12.67	13.33	16.67
Relative error of MVMS (%)	0.95	0.95	0.96	0.96	0.96	0.96	0.97	0.97	0.97	0.97	0.98
MOR (m)	3000	3500	4000	4500	5000	6000	9000	10000
Relative error of transmissometer (%)	20	23.33	26.67	30	33.33	40	60	66.67
Relative error of MVMS (%)	0.98	0.98	0.98	0.99	0.99	0.99	0.99	0.99

Abstract

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Applied Optics