Linear calibration function of luminescence quenching-based optical sensor for trace oxygen analysis†

The Analyst ◽  
1999 ◽  
Vol 124 (5) ◽  
pp. 695-698 ◽  
Author(s):  
Martin M. F. Choi ◽  
Dan Xiao
Keyword(s):  
Optical Sensor ◽  
Luminescence Quenching ◽  
Calibration Function ◽  
Linear Calibration

The Dynamic Calibration of Tipping-Bucket Raingauges

1986 ◽  
Vol 17 (3) ◽  
pp. 203-214 ◽  
Author(s):  
Janusz Niemczynowicz
Keyword(s):  
Rainfall Intensity ◽  
Nordic Countries ◽  
Dynamic Calibration ◽  
Calibration Function ◽  
Linear Calibration ◽  
Calibration Curves ◽  
Non Linear ◽  
Rainfall Volume

The dynamic calibration of three types of tipping-bucket raingauges extensively used in the Nordic countries was performed. The tested and calibrated gauges were: “LTH gauge”, PLUMATIC gauge and RIMCO gauge. It was found that with regard to all tested gauges, the volume of water which tips the bucket is not a constant characteristic for the gauge; it depends on rainfall intensity. Thus, in order to avoid errors, a calculation of the rainfall intensity or of rainfall volume from tipping-bucket registrations must go through empirical, usually non-linear calibration function. The procedure involved in the dynamic calibration of the tipping-bucket raingauges is described in the paper. Examples of typical calibration curves are provided. The magnitude of errors, in respect of measured rainfall intensity, which occur when linear gauge calibration is used is stated too.

scholarly journals Design, Fabrication and Testing of a High-Sensitive Fibre Sensor for Tip Clearance Measurements

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2610 ◽  
Author(s):  
Gaizka Durana ◽  
Josu Amorebieta ◽  
Ruben Fernandez ◽  
Josu Beloki ◽  
Eneko Arrospide ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Fibre Bundle ◽  
Single Mode ◽  
Measurement Range ◽  
Tip Clearance ◽  
Experimental Program ◽  
Linear Calibration ◽  
Distance Measurements ◽  
Reflected Light ◽  
Highly Sensitive

A highly sensitive fibre bundle-based reflective optical sensor has been designed and fabricated for Tip Clearance measurements in a turbine rig. The sensor offers high spatial and temporal resolution. The sensor probe consists of a single-mode transmitting fibre and two concentric rings of receiving multimode fibres that collect reflected light in a differential detection gain configuration, yielding a highly linear calibration curve for distance measurements. The clearance measurement range is approximately 2 mm around the central point fixed at 3.2 mm from the probe tip, and the sensitivity of the probe is 61.73 mm−1. The fibre bundle has been designed to ensure that the distance security specifications required for the experimental program of the turbine are met. The optical sensor has operated under demanding conditions set by the blade and casing design. The experimental results obtained so far are promising and lead us to think that the optical sensor has great potential for online clearance measurements with high precision.

Novel method for tyrosine assessment in vitro using luminescence quenching of the nano optical sensor Eu–ciprofloxacin doped in a sol–gel matrix

RSC Advances ◽  
2016 ◽  
Vol 6 (25) ◽  
pp. 20467-20474 ◽  
Author(s):  
M. S. Attia ◽  
Amr A. Yakout
Keyword(s):  
Blood Serum ◽  
Optical Sensor ◽  
Luminescence Intensity ◽  
Low Cost ◽  
Sol Gel ◽  
Luminescence Quenching ◽  
Hair Samples ◽  
Novel Method ◽  
Sensitive Method

A low cost and very sensitive method for the assessment of tyrosine in blood serum, urine and hair samples was developed. The method was based upon the luminescence intensity of a Eu–ciprofloxacin complex nano optical sensor.

scholarly journals First Derivative Spectrophotometric Determination of Demeclocycline and Minocycline in Clinical Samples, Urine and Honey

1970 ◽  
Vol 8 (8) ◽  
pp. 34-38 ◽  
Author(s):  
A Raghavendra Guru Prasad ◽  
V Suryanarayana Rao
Keyword(s):  
Spectrophotometric Determination ◽  
Clinical Samples ◽  
Calibration Function ◽  
Linear Calibration ◽  
Ultraviolet Spectrophotometry ◽  
Zero Crossing ◽  
First Derivative ◽  
Scientific World ◽  
Linear Concentration

The authors present simple and rapid method for the first derivative spectrophotometric determination of demeclocycline (DMC) and minocycline (MNC). The linear calibration function is established in the concentration range 10 to 50 μg/ml for DMC and 10 to 60 μg/ml for MNC. The proposed method is also applied for their resolution in synthetic binary mixtures. The resolution is based on the first derivative ultraviolet spectrophotometry with zero crossing measurement. The corresponding calibration function is linear in the rage 10 to 40 μg/ml for DMC and 10 to 50 μg/ml for MNC. The proposed methods are found to be selective, linear (R > 0.99), accurate (recovery = 98 to 104%) and precise (RSD < 1.1%) in the respective linear concentration ranges. The method is successfully applied for the analysis of these drugs in clinical samples, urine and honey without pretreatment. Keywords: Demeclocycline; Minocycline; First derivative; Resolution; Applications. DOI: 10.3126/sw.v8i8.3843 Scientific World Vol.8(8) 2010 pp.34-38

scholarly journals Luminescent determination of ascorbic acid in dietary supplements

2017 ◽  
Vol 11 (2) ◽  
Author(s):  
E. Malinka ◽  
S. Beltyukova ◽  
Ie. Cherednychenko
Keyword(s):  
Ascorbic Acid ◽  
Luminescent Properties ◽  
Luminescence Quenching ◽  
Luminescence Spectra ◽  
Calibration Plot ◽  
Linear Calibration ◽  
Quenching Rate ◽  
Quenching Rate Constant ◽  
Relationship Of

The article presents the results of the ascorbic acid (AA) determination with using a complex of an Tb (III) ion with ciprofloxacin (CF) as a lanthanide luminescent marker. The luminescent properties of the Tb (III)-CF complex in the presence of AA were studied. The excitation and luminescence spectra, triplet level of ligand, the kinetics of the luminescence decay of the Tb(III)-CF complex in the presence of AA were analyzed. The excitation spectrum of the Tb (III)- CF complex has broad bands with maxima at 302 and 355 nm that corresponding to the n→π* electronic transition in the absorption spectrum of ligand. The luminesce spectra demonstrate the emission transitions arising from 5D4 energy level to 7Fj multiplet ground state. The luminescence of the Tb(III)-CF complex was found to be quenched by AA. It was established that the lifetime of the excited 5D4 state of the Tb (III) ion decreases with AA concentration increasing up to 0,25 mg/сm3. Luminescence quenching of the Tb (III)-CF complex by AA follows the Stern-Volmer relationship of AA. The Stern-Volmer constant K is 2478 dm3/mol. The biomolecular quenching rate constant kq is 1,25∙107 dm3/mol. The effect of luminescence quenching of the Tb (III)-CF complex was used to developing the procedure for determining of AA in the dietetic additives «Asvitol» and «Ascorbic acid». The linear calibration plot for AA was obtained over the concentration range of 0,02 to 0,25 mg/сm3.

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