Calibration of Near-Infrared Detectors Using a Wavelength Tunable Light Source

Maham, Kinza; Vaskuri, Anna; Manoocheri, Farshid; Ikonen, Erkki

doi:10.1007/s10043-020-00586-9

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…The standard uncertainty in the central wavelength was determined by scanning the collimated beam against a calibrated radiometer. 19 The results show that the laser-line tunable filter has a standard uncertainty of 0.15 nm. The uncertainty in BTDF is determined from the slope of the BTDF as a function of wavelength, which is sample dependent.…”

Section: B Uncertainty Budget For Aalto's Btdf Facilitymentioning

confidence: 92%

Development of primary reference facilities and measurement comparison of standard artifacts for the bidirectional transmittance distribution function

Fu,

Quast,

Velke

et al. 2023

Review of Scientific Instruments

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To determine the bidirectional transmittance distribution function (BTDF) of diffusely transmitting materials, two new primary facilities have been developed at the Physikalisch-Technische Bundesanstalt (PTB) and Aalto University (Aalto). A detailed description of both facilities and the different approaches used are presented in this paper. The performance of both facilities is compared by determining the BTDF of two different diffuser types in both in-plane and out-of-plane bidirectional geometries at four different wavelengths in the visible spectral range. Due to delayed completion of PTB’s primary facility, the measured BTDF values are compared between Aalto’s primary facility and another PTB setup, whose measurement scales are successfully transferred to PTB’s primary facility by an internal comparison. A thorough analysis of the measurement uncertainty is presented, leading to a combined k = 1 standard uncertainty of 0.8%–1.2% for PTB’s primary facility and 1.3%–1.7% for Aalto’s primary facility. The BTDF results obtained agree well within their expanded k = 2 uncertainty. This indirect bilateral comparison shows that Aalto’s and PTB’s new facilities are suited as primary reference setups for the determination of the BTDF. These studies also reveal action points to improved measurement capabilities and for a reduction of the measurement uncertainty, depending on the type of diffuser under test.

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Section: B Uncertainty Budget For Aalto's Btdf Facilitymentioning

confidence: 92%

Development of primary reference facilities and measurement comparison of standard artifacts for the bidirectional transmittance distribution function

Fu,

Quast,

Velke

et al. 2023

Review of Scientific Instruments

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show abstract

“…In the 3D gonioreflectometer, wavelength uncertainty originates from the limitations of LLTF filters that were previously studied in [34]. The study showed that after corrections applied in the operation software, the standard uncertainty of wavelength is u λ c = 0.15 nm.…”

Section: Illumination Central Wavelengthmentioning

confidence: 97%

Gonioreflectometer for measuring 3D spectral BRDF of horizontally aligned samples with traceability to SI

2022

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Present article describes a 3D gonioreflectometer developed at Aalto University for the measurement of spectral bidirectional reflectance distribution function (sBRDF) of horizontally aligned samples, needed to study sBRDF of sand from satellite calibration test sites. The new set-up incorporates three motorized arms that allow to measure in- and out-of-plane sBRDF. Illumination of the sample is provided by a supercontinuum laser coupled with laser line tunable filters (LLTFs) and detection is performed with two types of photodiodes (Si and InGaAs) enabling collection of sBRDF in the spectral range from 450 nm to 1700 nm. The instrument is operated in the relative mode and its traceability to SI is achieved with the help of a 2D absolute reference gonioreflectometer available at Aalto University. The calibration procedure as well as system’s uncertainty estimation are described. The performance of the 3D gonioreflectometer is validated by measurements of a ceramic diffuse reflectance sample.

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“…Appropriate calibrated reference detectors were used at each wavelength. [14][15][16] Figure 4 shows the responsivity results scaled by the average of the responsivity in the range from 0.325 µm to 214 µm. The results are corrected for the differences in the TPX and KBr window transmittances.…”

Section: Spectral Responsivitymentioning

confidence: 99%

Cantilever-based photoacoustic sensor for terahertz range

Ikonen

Sharma

Ahmadi

et al. 2023

Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI

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Advantages of photoacoustic detection with a silicon cantilever microphone are demonstrated in the THz range. In our method, earlier membrane microphone is replaced with robust silicon cantilever microphone, which can tolerate high intensity of the input radiation in contrast to vulnerable membrane. The responsivity of the photoacoustic sensor was confirmed to be constant over almost six orders of magnitude of input power, which is not easy to achieve with any other detector of THz radiation. Another favorable feature of the photoacoustic sensor is its uniform spatial responsivity over areas of several millimeters in size. Finally, we measured nearly constant spectral responsivity of the photoacoustic sensor for the wavelength range of 0.3 μm to 200 μm.

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Calibration of Near-Infrared Detectors Using a Wavelength Tunable Light Source

Cited by 7 publications

References 18 publications

Development of primary reference facilities and measurement comparison of standard artifacts for the bidirectional transmittance distribution function

Development of primary reference facilities and measurement comparison of standard artifacts for the bidirectional transmittance distribution function

Gonioreflectometer for measuring 3D spectral BRDF of horizontally aligned samples with traceability to SI

Cantilever-based photoacoustic sensor for terahertz range

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