Least squares best fit line method for the evaluation of measurement uncertainty with electromechanical transducers (EMT) with Electrical Outputs (EO)

Yadav, Sanjay; Kumaraswamy, Balachandra; Gupta, Vishal; Bandyopadhyay, A. K.

doi:10.1007/s12647-010-0012-z

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…The critical importance of addressing uncertainty in scientific measurements have been discussed at length by various researchers [31][32][33]. Uncertainties in validation of this model might originate from: (1) Rooms were made airtight by tightly closing doors and windows and blocking visible gaps under doors and windows etc., but engineered leak-proofing techniques was not followed, (2) operation of ceiling/pedestal fans may not guarantee perfect homogeneous mixing of indoor CO 2 , (3) CO 2 detectors have certain accuracy levels and hence have inherent uncertainty in measurements.…”

Section: Resultsmentioning

confidence: 99%

Modelling Accumulation of Respiratory-CO2 in Closed Rooms Leading to Decision-Making on Room Occupancy

Majumdar

Chatterjee

2020

MAPAN

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A model predicting time required to attain undesired levels of respiratory-CO 2 in closed rooms is described. The model works under the following assumptions: (1) room air is well-mixed, (2) indoor CO 2 does not exchange with outdoor CO 2 , (3) there is no effect of individual occupants on CO 2 exhalation rate of other occupants, (4) there is no indoor CO 2 sink and all exhaled CO 2 end up increasing CO 2 concentration in the room, (5) apart from respiration, there is no other source of indoor CO 2 , (6) breathing rates of occupants are constant throughout the period of occupation of room. The model makes use of anthropocentric parameters like body weight, height, du bois surface area, MET levels, etc., to calculate dedicated individual CO 2 exhalation rate and uses room volume and number of occupants to predict time required to reach user-earmarked levels of CO 2 . A model run showed that in a closed room of 12 9 12 9 10 m 3 , respiration by one person at rest (65 kg body weight, 1.7 m height, basal respiratory quotient of 0.83) would take 4.37 h to reach 2000 ppmV indoor CO 2 when background indoor CO 2 level was 380 ppmV. This model would help allocating desired number of occupants in closed rooms to help avoid building up of undesirable levels of CO 2 in poorly ventilated offices, schools, hospitals or households that might frequently experience high levels of indoor CO 2 , undermining health and performance of occupants, patients and workers.

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Section: Resultsmentioning

confidence: 99%

Modelling Accumulation of Respiratory-CO2 in Closed Rooms Leading to Decision-Making on Room Occupancy

Majumdar

Chatterjee

2020

MAPAN

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“…However, our observations reveal that 8th order fit is most suitable in such cases [ Fig.3(d)]. In such cases, the uncertainty of the calibration curve is estimated from the calibration coefficients [24][25] and is root-sumsquares of residuals obtained as suggested above for the computation of the overall uncertainty associated with pressure measurement.…”

Section: Resultsmentioning

confidence: 99%

Investigations on Measurement Uncertainty and Stability of Pressure Dial Gauges and Transducers

Yadav¹,

Gupta²,

Bandyopadhyay³

2010

Measurement Science Review

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Several commercial instruments are available for pressure measurements. As per ISO stipulations, whenever such instruments are used for precise and accurate pressure measurements, it is obligatory on the part of measurement authority to indicate the quality of results. Stability of the pressure measuring instruments over the years is one of the important parameters in defining the quality of results quantitatively. Also, it helps the users to decide the optimum calibration interval of the particular instrument. In the present investigation, we have studied a number of analogue / digital pressure transducers / transmitters / calibrators and pressure dial gauges. The present paper describes the results of the studies carried out on several pressure dial gauges and transducers in the pressure range up to 500 MPa, calibrated several times over the years, as examples. A new approach is proposed for the establishment of measurement uncertainty for such instruments by characterizing the data obtained during calibration over the years using curve fitting.

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“…The uncertainty budget [5][6] for calibration of strain amplifier with load cell is given in Table 3.…”

Section: Measurement Resultsmentioning

confidence: 99%

Establishment of traceability for strain measuring data acquisition system in terms of voltage

Pal

Kumar

Madan

et al. 2010

MAPAN

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This paper emphasizes on establishment of traceability for the strain measuring data acquisition system in terms of voltage. If this amplifier's output voltage is not calibrated then traceability chain breaks. To complete the traceability chain, the amplifier's output voltage has been calibrated for corresponding strain. The sensitivity is calculated using calibration results and further used to feed in data acquisition system to display the result in terms of force/strain.

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Least squares best fit line method for the evaluation of measurement uncertainty with electromechanical transducers (EMT) with Electrical Outputs (EO)

Cited by 7 publications

References 7 publications

Modelling Accumulation of Respiratory-CO2 in Closed Rooms Leading to Decision-Making on Room Occupancy

Modelling Accumulation of Respiratory-CO2 in Closed Rooms Leading to Decision-Making on Room Occupancy

Investigations on Measurement Uncertainty and Stability of Pressure Dial Gauges and Transducers

Establishment of traceability for strain measuring data acquisition system in terms of voltage

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