The measurement uncertainty of the eye muscle area analyzer is defined as the reasonable dispersion of the measured value, which is the basis for determining the quality of the measurement results. All measurement results have uncertainty, and the usability of the measurement results largely depends on the magnitude of its uncertainty. The backfat thickness and eye muscle area of live pigs were measured using an eye muscle area analyzer, and the uncertainty components affecting the measurement results were evaluated to ensure the reliability of the backfat thickness and eye muscle area measurement data of live pigs using the backfat analyzer.

High definition imported eye muscle area measuring instrument

Identification of sources of measurement uncertainty for eye muscle area measuring instrument

Due to the fact that the values of live pig backfat thickness and eye muscle area are directly read after measurement, the uncertainty of the measurement results of live pig backfat thickness and eye muscle area comes from two aspects. Firstly, the accuracy of B-mode ultrasound diagnostic equipment, which belongs to Class B uncertainty; The second is the repeatability of the measurement, which belongs to Class A uncertainty.

Analysis and Calculation of Measurement Uncertainty Components of Eye Muscle Area Measuring Instrument

Thick backfat of live pigs

The standard uncertainty u (m) introduced by B-type ultrasound equipment: When measuring the thickness of live pig backfat with B-type ultrasound equipment, the maximum allowable error of the longitudinal geometric position indication is 10%. Considering uniform distribution, u (m)=10% (31/2)=5.8%

Determination of standard uncertainty introduced by repeatability u (v): Based on the relative deviation of two parallel measurements of backfat thickness of the same live pig using an eye muscle area measuring instrument, which is not greater than 3%, u (v)=3% (2 × 21/2)=1.1%

The standard uncertainty u (m) introduced by B-type ultrasound equipment: When measuring the live eye muscle area of pigs with B-type ultrasound equipment, the maximum allowable error of the lateral geometric position indication is 15%. Considering uniform distribution, u (m)=15% (31/2)=8.7%

The standard uncertainty u (v) introduced by the determination of repeatability: According to the eye muscle area measuring instrument, if the relative deviation of two parallel measurements of the eye muscle area of the same live pig is not greater than 3%, then u (v): 3% (2 × 21/2)=1.1%

Extended uncertainty U of eye muscle area measuring instrument

Thick backfat of live pigs

The display of the backfat meter is generally expressed in terms of expanded uncertainty. Taking the factor k-2 (with a confidence probability of about 95), the expanded uncertainty of the measurement of live pig backfat thickness is u=K × [u (m) 2+u (v) 2] 1/2=11.8%

Pig live eye muscle area

The backfat meter display is generally expressed in terms of expanded uncertainty. If the inclusion factor k=2 (with a confidence probability of about 95%) is taken, the expanded uncertainty of pig live eye muscle area measurement is U=K × [u (m) 2+u (v 2)] 1/2=17.5%

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