METHOD OF MONITORING METROLOGICAL SERVICEABILITY OF MEASURING CHANNELS Russian patent published in 2024 - IPC G01D18/00 

FIELD: measuring.

SUBSTANCE: invention relates to measurement equipment and can be used in machine building, power, thermal, nuclear and other industries, as well as in scientific research, in situations when it is required to control the metrological characteristics of several measuring channels within the specified limits. Method of monitoring metrological health of measuring channels consists in the fact that readings of controlled measuring channels y_k are recorded and stored, where k = 1, …, m, which measure the same physical parameter x and are characterized by known errors u_k, which form m uncertainty intervals Y_k = [y_k – u_k, y_k + u_k]. Formed is combined interval Y = [a₁, a_n], where a₁ is the smallest of the values y_k – u_k; a_n is the largest of the values y_k + u_k. Then determined are discrete values a_i = a_i-1 + h, where i = 2, …, n -1; h = (a_n – a₁) / (n – 1) – distance between discrete values; n is the number of discrete values equal to 11. Thereafter, composed is a matrix S= [s_ij] of pairwise comparisons of discrete values a_i, where , where i ≠ j = 1, …, n; I_k(a_i, a_j) – indicator function, which is determined as follows: I_k(a_i, a_j) = 2, if a_i belongs to the interval Y_k and a_j does not belong to Y_k, I_k(a_i, a_j) = 1, if a_i and a_j belong to the interval Y_k or a_i and a_j do not belong to the interval Y_k, I_k(a_i, a_j) = 0, if a_j belongs to the interval Y_k and a_i does not belong to Y_k. Then, string sums are determined for matrix S. Discrete value a_i, with maximum string sum z_i is used as reference value y^* to determine relative deviation by formula: δ_k = (y_k – y^*) / y^*. Storing the obtained relative deviations δ_k and reference value y^*. Comparing the value of each relative deviation δ_k with specified limit of permissible deviation δ_per and in case of its exceeding, this event is recorded and a decision is made on failure of the measuring channel.

EFFECT: high accuracy of estimating the reference value of the measured physical quantity and reducing the probability of type 1 and type 2 errors when monitoring metrological serviceability of measuring channels.

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