Development of a calibration standard of the spectral radiance for optical sensors

Yasuji, Y.; Yoriko, A.; Sassa, Fumihiro

doi:10.1109/sice.2002.1196613

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Furthermore, we performed additional calibration at the Japan Aerospace Exploration Agency (JAXA). The spectral irradiance of each spectroradiometer with attached collimation tube was compared with that of two types of integrating spheres traceable to a Japanese national standard fixed-point blackbody furnace by the Japan Calibration Service System (Yamamoto et al, 2002). The maximum difference within the PAR waveband was 1.8% at = 400 nm, and the average difference was 0.95% (Fig.…”

Section: Spectroradiometersmentioning

confidence: 99%

On the stability of radiometric ratios of photosynthetically active radiation to global solar radiation in Tsukuba, Japan

Akitsu

Kume

Hirose

et al. 2015

Agricultural and Forest Meteorology

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Section: Spectroradiometersmentioning

confidence: 99%

On the stability of radiometric ratios of photosynthetically active radiation to global solar radiation in Tsukuba, Japan

Akitsu

Kume

Hirose

et al. 2015

Agricultural and Forest Meteorology

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“…The SVA uncertainty is 1 % (see Part 2, Uchiyama et al, 2018); the disk scan data were taken at MLO, where measurement conditions were good for the solar disk scan. The uncertainty of the integrating sphere was 1.7 % (Yamamoto et al, 2002). Considering the magnitude of these errors, the above differences in the calibration constants seem reasonable.…”

Section: Calibration Using the Calibrated Light Sourcementioning

confidence: 72%

“…In this study, the integrating sphere, which is calibrated and maintained by the Japanese Aerospace Exploration Agency (JAXA), was used (Yamamoto et al, 2002). This integrating sphere is used to calibrate the radiometers that are used to validate satellite remote sensing products.…”

Section: Calibration Using the Calibrated Light Sourcementioning

confidence: 99%

The instrument constant of sky radiometers (POM-02) – Part 1: Calibration constant

2018

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Abstract. Ground-based networks have been developed to determine the spatiotemporal distribution of the optical properties of aerosols using radiometers. In this study, the precision of the calibration constant (V0) for the sky radiometer (POM-02) that is used by SKYNET was investigated. The temperature dependence of the sensor output was also investigated, and the dependence in the 340, 380, and 2200 nm channels was found to be larger than for other channels and varied with the instrument. In the summer, the sensor output had to be corrected by a factor of 1.5 % to 2 % in the 340 and 380 nm channels and by 4 % in the 2200 nm channel in the measurements at Tsukuba (36.05∘ N, 140.13∘ E), with a monthly mean temperature range of 2.7 to 25.5 ∘C. In the other channels, the correction factors were less than 0.5 %. The coefficient of variation (CV, standard deviation/mean) of V0 from the normal Langley method, based on the data measured at the NOAA Mauna Loa Observatory, is between 0.2 % and 1.3 %, except in the 940 nm channel. The effect of gas absorption was less than 1 % in the 1225, 1627, and 2200 nm channels. The degradation of V0 for wavelengths shorter than 400 nm (−10 % to −4 % per year) was larger than that for wavelengths longer than 500 nm (−1 to nearly 0 % per year). The CV of V0 transferred from the reference POM-02 was 0.1 % to 0.5 %. Here, the data were simultaneously taken at 1 min intervals on a fine day, and data when the air mass was less than 2.5 were compared. The V0 determined by the improved Langley (IML) method had a seasonal variation of 1 % to 3 %. The root mean square error (RMSE) from the IML method was about 0.6 % to 2.5 %, and in some cases the maximum difference reached 5 %. The trend in V0 after removing the seasonal variation was almost the same as for the normal Langley method. Furthermore, the calibration constants determined by the IML method had much higher noise than those transferred from the reference. The modified Langley method was used to calibrate the 940 nm channel with on-site measurement data. The V0 obtained with the modified Langley method compared to the Langley method was 1 % more accurate on stable and fine days. The general method was also used to calibrate the shortwave-infrared channels (1225, 1627, and 2200 nm) with on-site measurement data; the V0 obtained with the general method differed from that obtained with the Langley method of V0 by 0.8 %, 0.4 %, and 0.1 % in December 2015, respectively.

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Development of a spectral radiance calibration standard in the shortwave infrared (SWIR) range

Yamamoto

Nakajima

2007

SICE Annual Conference 2007

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Development of a calibration standard of the spectral radiance for optical sensors

Cited by 3 publications

References 7 publications

On the stability of radiometric ratios of photosynthetically active radiation to global solar radiation in Tsukuba, Japan

On the stability of radiometric ratios of photosynthetically active radiation to global solar radiation in Tsukuba, Japan

The instrument constant of sky radiometers (POM-02) – Part 1: Calibration constant

Development of a spectral radiance calibration standard in the shortwave infrared (SWIR) range

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