Nonlinearity measurements of high-power laser detectors at NIST

Li, Xiaoyu X.; Scott, Thomas R.; Shao, Yang; Cromer, Christopher L.; Dowell, Marla L.

doi:10.6028/jres.109.030

Cited by 13 publications

(11 citation statements)

References 7 publications

(5 reference statements)

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“…If the uncertainty in the CPC's proportional response is greater than the user's requirements, then additional corrections could be applied. One approach would be to consider a quadratic dependence of the true concentration on the measured concentration, such as done by Li et al (2004) in their study of nonlinearity in optical sensors.…”

Section: Discussionmentioning

confidence: 99%

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Condensation Particle Counter Proportionality Calibration from 1 Particle·cm⁻³to 10⁴Particles·cm⁻³

Owen

Mulholland

Guthrie

2012

Aerosol Science and Technology

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This article presents a process to calibrate a condensation particle counter (CPC) over the concentration range from 1 particle·cm −3 to 10 4 particles·cm −3 with traceability to SI units as realized by the National Institute of Standards and Technology (NIST). The process combines two independent steps: a proportionality assessment over the range of the CPC using a consistent diluter and an absolute calibration of the CPC with an aerosol electrometer (AE) at high concentrations. The proportionality assessment, which is the focus of the article, is analogous to the attenuation method for testing the proportionality of high-power laser detectors. This procedure tests the proportionality of one CPC by itself and does not require the use of a calibrated reference CPC. The primary calibration of the CPC with the AE at high concentrations allows for an absolute calibration with NIST traceability, resulting in a simple one-parameter correction to the measured CPC data. The proportionality test enables uncertainties to be assigned to the CPC over an extended range of concentration beyond the lower detection limit of the AE, thereby establishing measurement traceability for low concentrations. The relative expanded uncertainty of the CPC with a coverage factor of k = 2 is 2.8% over the range of about 1 particle·cm −3 to 10 4 particles·cm −3 .

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Section: Discussionmentioning

confidence: 99%

“…The third approach, which is the focus of this study, is analogous to the attenuation method for testing the proportionality of high-power laser detectors (Li et al 2004). The proportionality test of the laser detector uses a rotating optical chopper as a consistent attenuator.…”

Section: Introductionmentioning

confidence: 99%

Condensation Particle Counter Proportionality Calibration from 1 Particle·cm⁻³to 10⁴Particles·cm⁻³

Owen

Mulholland

Guthrie

2012

Aerosol Science and Technology

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“…The above equation is used for high-power laser detectors at NIST. 16,17 Because the calibration laboratory calibrates the power meters for clinical use (specific wavelength and clinical range between 0.5 and 3 W), thermopiles offer a very linear response and more accurate measurements to determine response nonlinearity is not necessary (see Subsection 1 of Appendix A). The calibration factor of nonlinearity of laser light source (for the same optical fiber) can be obtained by…”

Section: A3 Linearity Comparison Proceduresmentioning

confidence: 99%

Absolute calibration of optical power for PDT: Report of AAPM TG140

et al. 2013

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This report is primarily concerned with methods for optical calibration of laser power for continuous wave (CW) light sources, predominantly used in photodynamic therapy (PDT). Light power calibration is very important for PDT, however, no clear standard has been established for the calibration procedure nor the requirements of power meters suitable for optical power calibration. The purposes of the report are to provide guidance for establishing calibration procedures for thermopile type power meters and establish calibration uncertainties for most commercially available detectors and readout assemblies. The authors have also provided a review of the use of various power meters for CW and pulsed optical sources, and provided recommended temporal frequencies for optical power meter calibrations and guidance for routine quality assurance procedure.

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“…The primary standard used at the NIST is a K-series calorimeter providing 60 W measurement at 1 µm. In [6], the authors deal with nonlinearity sources of high-power laser detectors, which enhance the uncertainty of the traceability chain. The authors review the non-linearity sources inherent to thermal detectors: radiation losses and non-linear behaviour of temperature sensors.…”

Section: Introductionmentioning

confidence: 99%

RLCYC 75 : a 2 kW electrically calibrated laser calorimeter designed for Laser MegaJoule diagnostics calibration

Crespy¹,

Villate²,

Soscia³

et al. 2012

Metrologia

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RLCYC 75 is a new electrically calibrated laser calorimeter specially manufactured by Laser Metrology to calibrate energy diagnostics within the Laser MegaJoule (LMJ) facility. It consists of an optical cavity cooled by a hydraulic system. The system is designed to provide 1 µm wavelength power laser measurements with uncertainty less than 1% at 2 kW and traceability to the International System of Units (SI). In this paper, the accuracy of RLCYC 75 measurements is studied. More precisely, three points are detailed: instrumentation uncertainty estimation, equivalence between optical and electrical supply and light absorption. To this end, electrical calibration campaigns and power laser measurement campaigns are conducted. Moreover, thermal and optical models are developed. Results show that RLCYC 75 design and instrumentation are efficient enough to reach the goal of relative uncertainty of about 1% at 2 kW. RLCYC 75 will become the 2 kW laser power primary standard for LMJ applications.

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Nonlinearity measurements of high-power laser detectors at NIST

Cited by 13 publications

References 7 publications

Condensation Particle Counter Proportionality Calibration from 1 Particle·cm⁻³to 10⁴Particles·cm⁻³

Condensation Particle Counter Proportionality Calibration from 1 Particle·cm⁻³to 10⁴Particles·cm⁻³

Absolute calibration of optical power for PDT: Report of AAPM TG140

RLCYC 75 : a 2 kW electrically calibrated laser calorimeter designed for Laser MegaJoule diagnostics calibration

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Nonlinearity measurements of high-power laser detectors at NIST

Cited by 13 publications

References 7 publications

Condensation Particle Counter Proportionality Calibration from 1 Particle·cm−3to 104Particles·cm−3

Condensation Particle Counter Proportionality Calibration from 1 Particle·cm−3to 104Particles·cm−3

Absolute calibration of optical power for PDT: Report of AAPM TG140

RLCYC 75 : a 2 kW electrically calibrated laser calorimeter designed for Laser MegaJoule diagnostics calibration

Contact Info

Product

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Condensation Particle Counter Proportionality Calibration from 1 Particle·cm⁻³to 10⁴Particles·cm⁻³

Condensation Particle Counter Proportionality Calibration from 1 Particle·cm⁻³to 10⁴Particles·cm⁻³