CN-121995291-A - Calibration effective efficiency correction factor method

CN121995291ACN 121995291 ACN121995291 ACN 121995291ACN-121995291-A

Abstract

The invention provides a calibration effective efficiency correction factor method, which belongs to the technical field of coaxial microwave power references and comprises the steps of collecting a power sensor through a millivoltmeter, compressing an initial reference curve through an iterative algorithm based on the compression coefficient, converging to obtain a converging reference curve, and calculating according to the converging reference curve to obtain an effective efficiency correction factor, wherein radio frequency steady-state temperature rise electric potential in the radio frequency transient thermoelectric potential change curve is used as a steady-state value, the direct current transient thermoelectric potential change curve is normalized to be used as an initial reference curve, and the initial data and the steady-state value of the radio frequency transient thermoelectric potential change curve and the direct current transient thermoelectric potential change curve are calculated. The method solves the problems that the traditional effective efficiency correction factor calibration method is large in uncertainty and difficult to acquire and the acquisition difficulty is increased along with the frequency improvement.

Inventors

LIU YIYANG
CUI XIAOHAI
LI YONG
YUAN WENZE
LEI PU
DING CHENG

Assignees

中国计量科学研究院

Dates

Publication Date: 20260508
Application Date: 20260224

Claims (3)

1. A method of scaling an effective efficiency correction factor, comprising the steps of: Inputting radio frequency power to a calibrated power sensor, acquiring a radio frequency transient thermoelectric voltage change curve through a millivoltmeter, and taking radio frequency steady-state temperature rise potential in the radio frequency transient thermoelectric voltage change curve as a steady-state value; Inputting direct current power to a calibrated power sensor, acquiring a direct current transient thermoelectric voltage change curve through a millivoltmeter, and carrying out normalization processing on the direct current transient thermoelectric voltage change curve to obtain an initial reference curve; Calculating the difference maximum value of the radio frequency transient temperature rise potential in the front stage of the radio frequency transient thermoelectric voltage change curve and the direct current transient temperature rise potential in the front stage of the direct current transient thermoelectric voltage change curve, and taking the ratio of the difference maximum value to the steady state value as a compression coefficient; According to the compression coefficient, compressing an initial reference curve through an iterative algorithm, and separating the thermoelectric voltage of the heat insulation section of the power sensor and the thermoelectric voltage of the transmission line in the seat from a steady state value to obtain a convergence reference curve; And according to the convergence reference curve, introducing the loss of the transmission line in the seat of the power sensor to calculate, and obtaining an effective efficiency correction factor.
2. The method of scaling an effective correction factor according to claim 1, wherein the expression for compressing the initial reference curve by an iterative algorithm is as follows: Wherein, the Is the first A new reference curve for a number of iterations, As an initial reference curve of the graph, At the time of the steady-state value, Is the first The difference value of the number of iterations, Is the first The compression coefficients of the number of iterations, Is the first The thermoelectric potential generated by the heat insulation section of the next iteration, Is the first The thermoelectric potential generated by the transmission line in the iteration seat, Is a radio frequency temperature rise potential curve. The expression of the convergence criterion of the new reference curve is as follows: Wherein, the Is the first The difference value of the number of iterations, And when the convergence criterion of the new reference curve is met for the convergence threshold value, obtaining a convergence reference curve.
3. The method of scaling an effective correction factor according to claim 1, wherein the effective correction factor is expressed as follows: Wherein, the In order to effectively correct the factor for efficiency, As a thermal equivalent factor of the power lost on the transmission line within the power sensor, As a thermal equivalent factor of the loss power of the insulation segment, For the power loss ratio of the transmission line within the power sensor, For the power loss ratio of the thermal insulation section of the power sensor, Is the steady state value of the radio frequency temperature rise potential curve, In order to converge the steady state value of the reference curve, To consume power on the transmission line within the power sensor, For the net power lost to the power sensor, Power lost to the insulation segment.

Description

Calibration effective efficiency correction factor method Technical Field The invention belongs to the technical field of coaxial microwave power references, and particularly relates to a calibration effective efficiency correction factor method. Background The research progress of the calibration method of the coaxial microwave power reference in the last decades is lagged behind the progress of the industrial technology, and the method has become a key bottleneck for restricting the tracing of the coaxial microwave/millimeter wave power. The maximum working frequency of the current commercial coaxial power sensor reaches 110GHz (1.0 mm joint), but the reported upper limit of the coaxial power reference is only 50GHz (2.4 mm joint), and the international key comparison still stays at the N-type (18 GHz) level (CCEM. RF-K8. CL) completed in 2000. The key symptom of the hysteresis is that the determination method of the effective efficiency correction factor g has technical bottlenecks, the effect of g is to correct the influence of the loss of the heat insulation transmission line on the heat measurement result, and the acquisition mode of the method is that the waveguide reference can realize signal isolation through a short circuit test and directly determine the correction factor g, the coaxial reference can not realize an ideal short circuit or open circuit state on line, and the influence of the heat insulation section is independently measured through space isolation methods such as a back to back test, a short circuit seat/open circuit seat test and the like to indirectly determine the correction factor g. However, with the increase of frequency, the loss of the heat insulation section is obviously increased, so that the mirror image condition required by the back to back experiment is difficult to meet, the preparation of an ideal short circuit/open circuit seat is also challenging, and the bottleneck which is difficult to break through is encountered in the development of the millimeter wave section coaxial power reference by relying on a technical route of acquiring an effective efficiency correction factor by a physical isolation method. Disclosure of Invention Aiming at the defects in the prior art, the method for calibrating the effective efficiency correction factor solves the problems that the traditional effective efficiency correction factor calibration method is large in uncertainty and difficult to acquire and the acquisition difficulty is increased along with the frequency improvement. In order to achieve the above purpose, the technical scheme adopted by the invention is that the method for calibrating the effective efficiency correction factor comprises the following steps: Inputting radio frequency power to a calibrated power sensor, acquiring a radio frequency transient thermoelectric voltage change curve through a millivoltmeter, and taking radio frequency steady-state temperature rise potential in the radio frequency transient thermoelectric voltage change curve as a steady-state value; Inputting direct current power to a calibrated power sensor, acquiring a direct current transient thermoelectric voltage change curve through a millivoltmeter, and carrying out normalization processing on the direct current transient thermoelectric voltage change curve to obtain an initial reference curve; Calculating the difference maximum value of the radio frequency transient temperature rise potential in the front stage of the radio frequency transient thermoelectric voltage change curve and the direct current transient temperature rise potential in the front stage of the direct current transient thermoelectric voltage change curve, and taking the ratio of the difference maximum value to the steady state value as a compression coefficient; According to the compression coefficient, compressing an initial reference curve through an iterative algorithm, and separating the thermoelectric voltage of the heat insulation section of the power sensor and the thermoelectric voltage of the transmission line in the seat from a steady state value to obtain a convergence reference curve; And according to the convergence reference curve, introducing the loss of the transmission line in the seat of the power sensor to calculate, and obtaining an effective efficiency correction factor. Aiming at the problem that the effective efficiency correction factor calculated by the traditional physical isolation method is inaccurate under a high-frequency scene, the invention provides a calibration effective efficiency correction factor method, physical isolation is not needed, transient temperature rise potential of a power sensor under radio frequency power and transient temperature rise potential of a load under direct current power are collected through a calorimeter, coupling loss between a heat insulation section and a transmission line in a seat is separated through iterative decoupling, and then the effective effi