Spectral calibration of radiometric detectors using tunable laser sources

This paper presents the experimental characterization of predictable quantum efficient detectors, which have been designed for use at room temperature. The aim of the characterization was to validate modelled properties experimentally and, thus, the feasibility of such room temperature predictable quantum efficient detectors to be used as primary radiometric standards for applications in the fields of photometry and radiometry with an aimed uncertainty level of 0.01%. The characterizations were focused on linearity, thermal, angular, spectral and polarization dependencies of the detector that need to be known and considered in the respective applications. The results of the characterization measurements confirm the predictability of the detector, within the aimed 0.01% uncertainty level and, thus, the high potential for using that kind of devices as primary standards for applications in radiometry and photometry.

show abstract

“…The laser system is described in [17]. The measurements were carried out at four wavelengths: 400 nm, 515 nm, 680 nm, and 800 nm.…”

Section: Angular Dependencementioning

confidence: 99%

Characterization of a room temperature predictable quantum efficient detector for applications in radiometry and photometry

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The absolute spectral radiance responsivity of the LP3 obtained with the two facilities are plotted over the measured wavelength range on a logarithmic scale in Figure 3 and close to the center wavelength showing the bandpass region on a linear scale in Figure 4 with the spectral bandwidth of 1 nm for the monochromator-based facility. The results from the laser-based facility in the wavelength range between 535 nm to 618 nm are given after applying the correction algorithm [9]. From Figure 3, it can be clearly seen that out-of-band responsivity values of the LP3 by the monochromatorbased measurement are at least one order of magnitude larger than that from the laser-based measurement due to the higher noise level.…”

Section: Comparison Resultsmentioning

confidence: 99%

“…Thereby the frequency components resulting from the interference fringes are selectively damped using digital filtering according to the scheme in Figure 5. The detailed method is described in [9]. As can be seen in Figure 4, significant differences between spectral responsivity values from both facilities were found at some wavelength range.…”

Section: Comparison Resultsmentioning

confidence: 99%

“…The uncertainty component due to the digital filtering algorithm is estimated from simulations as described in [9]. O nm (s mono -s laser )/s average levels, because recent results showed no significant non-linearity of the used radiation thermometer [11].…”

Section: Uncertainty Estimationmentioning

confidence: 99%

“…To validate the new calibration set-up, its calibration results are here compared to those obtained at a laser-based facility. Since the TUneable Laser In Photometry (TULIP) facility of PTB has been well established for absolute calibration of optical detectors both in irradiance and radiance mode [9], it is reasonable to perform a comparison between the two calibration schemes. Therefore, a main purpose of this paper is to compare the absolute calibration of a radiation thermometer based on the monochromator set-up and the TULIP facility.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A comparison of absolute calibrations of a radiation thermometer based on a monochromator and a tunable source

Keawprasert¹,

Anhalt²,

Taubert³

et al. 2013

AIP Conference Proceedings

View full text Add to dashboard Cite

Articles you may be interested inDealing with the size-of-source effect in the calibration of direct-reading radiation thermometer AIP Conf.Abstract. An LP3 radiation thermometer was absolutely calibrated at a newly developed monochromator-based set-up and the TUneable Lasers in Photometry (TULIP) facility of PTB in the wavelength range from 400 nm to 1100 nm. At both facilities, the spectral radiation of the respective sources irradiates an integrating sphere, thus generating uniform radiance across its precision aperture. The spectral irradiance of the integrating sphere is determined via an effective area of a precision aperture and a Si trap detector, traceable to the primary cryogenic radiometer of PTB. Due to the limited output power from the monochromator, the absolute calibration was performed with the measurement uncertainty of 0.17 % (k = 1), while the respective uncertainty at the TULIP facility is 0.14 %. Calibration results obtained by the two facilities were compared in terms of spectral radiance responsivity, effective wavelength and integral responsivity. It was found that the measurement results in integral responsivity at the both facilities are in agreement within the expanded uncertainty (k = 2). To verify the calibration accuracy, the absolutely calibrated radiation thermometer was used to measure the thermodynamic freezing temperatures of the PTB gold fixed-point blackbody.

show abstract

Uncertainty evaluation and propagation for spectral measurements

Schmähling

Wübbeler

Ruggaber

et al. 2017

Color Research & Application

Self Cite

View full text Add to dashboard Cite

The measurement of the spectral power distribution (SPD) of a radiation source by array spectroradiometers is a technique that is widely used. In many applications, quantities that are derived from the SPD by a weighted integral over a wavelength interval are of interest. These integral quantities ought to be accompanied by a reliable uncertainty statement, for example, to assess conformity with prescribed limits or in order to judge the consistency of results obtained at different laboratories. We have developed a generally applicable Monte Carlo procedure for evaluating the uncertainty of spectral measurements. The procedure naturally accounts for correlations in the SPD which turn out to be crucial. Means are provided to handle and transfer these large-scale correlation matrices easily. The proposed approach is illustrated by the determination of the SPD of colored LEDs from array spectroradiometer measurements, together with the derived CIE 1931 color coordinates. MATLAB TM software implementing the proposed analysis procedure is made available. K E Y W O R D Scolor coordinates, photometry, radiometry, spectral measurements, uncertainty 6 |

show abstract

Spectral calibration of radiometric detectors using tunable laser sources

Cited by 24 publications

References 12 publications

Characterization of a room temperature predictable quantum efficient detector for applications in radiometry and photometry

Characterization of a room temperature predictable quantum efficient detector for applications in radiometry and photometry

A comparison of absolute calibrations of a radiation thermometer based on a monochromator and a tunable source

Uncertainty evaluation and propagation for spectral measurements

Contact Info

Product

Resources

About