阅读说明：本技术 一种新型双绞线及微小交流量子电压跨温区传输方法 (Novel twisted pair and micro alternating current quantum voltage trans-temperature-zone transmission method ) 是由 康焱 张力丹 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种新型双绞线及微小交流量子电压跨温区传输方法,属于线缆技术领域；两根等长的金属漆包线相互均匀缠绕后由绝缘套管包裹后形成双绞线,可以利用该新型双绞线传输进行跨温区的微小交流量子电压传输；该双绞线应用于低温到常温之间的跨温区信号传输,抑制了引线传输时产生的直流分量的影响,有利于准确测量微小交流量子电压。(The invention discloses a novel twisted pair and a micro alternating current quantum voltage trans-temperature region transmission method, belonging to the technical field of cables; two metal enameled wires with equal length are uniformly wound with each other and then wrapped by an insulating sleeve to form a twisted pair, and micro alternating current quantum voltage transmission across a temperature region can be carried out by utilizing the novel twisted pair; the twisted pair is applied to trans-temperature zone signal transmission between low temperature and normal temperature, inhibits the influence of direct current components generated during lead wire transmission, and is beneficial to accurately measuring micro alternating current quantum voltage.)

1. A novel twisted pair, said twisted pair comprising: the metal enameled wires are equal in length, and the two metal enameled wires are wrapped by the insulating sleeve after being uniformly wound.

2. The twisted pair of claim 1, wherein said metallic enameled wire is a pure copper enameled wire.

3. The twisted pair of claim 2, wherein said two of said plain copper coated wires are of equal diameter.

4. The twisted pair of claim 3, wherein said plain copper enameled wire has a diameter of less than 0.2 mm.

5. The novel twisted pair of claim 1, wherein said insulating jacket is a polytetrafluoroethylene jacket.

6. A transmission method of micro alternating current quantum voltage across temperature regions is characterized in that the novel twisted pair of any one of claims 1 to 5 is adopted to carry out transmission of the micro alternating current quantum voltage across temperature regions.

Technical Field

The invention relates to the technical field of cables, in particular to a novel twisted pair and a micro alternating current quantum voltage trans-temperature region transmission method.

Background

The generation and synthesis of the quantized ac voltage is based on the ac josephson effect, i.e. the step of the synthesized quantum voltage is related to the frequency and the josephson junction number. The programmable Josephson quantum voltage standard generates step-shaped alternating current quantum voltage by changing the number of Josephson unijunctions, and realizes the simulation of alternating current voltage signals. However, since it is limited by the single junction quantum voltage value, it is difficult to synthesize and accurately measure alternating voltages of millivolts or less, especially microvolts.

At present, the synthesis of the micro alternating current quantum voltage can only be realized by a method of changing the microwave driving frequency, the synthesis of a standard alternating current voltage signal can be realized, and the magnitude can reach the microvolt magnitude.

In a micro alternating current quantum voltage system, a Josephson junction working in liquid helium is driven by microwaves and bias signals, and a micro alternating current quantum voltage signal can be generated and synthesized; because the Josephson junction is placed at the bottom of the low-temperature liquid helium Dewar and is soaked below the liquid helium level, the alternating current quantum voltage signal generated by the Josephson junction is led out from the low temperature and needs a long lead. The coaxial line has very good anti-interference capability, and the external shielding layer of the coaxial line can ensure that the coaxial line has no radiation loss basically and is hardly interfered by external signals, so the lead wire is usually the coaxial line.

The coaxial line has a good transmission effect in the trans-temperature region transmission of the alternating current quantum voltage of more than 10mV, but aiming at the small extreme value quantity of the alternating current voltage, the synthesized small alternating current voltage value is too low and usually reaches hundreds or even dozens of microvolts, and the direct current component generated after the small alternating current voltage crosses the temperature region of nearly 300 ℃ through the coaxial line is far larger than the small alternating current voltage component, so that the output and the measurement of the small alternating current quantum voltage are greatly influenced. For example, when Josephson at low temperature is combined into 100 μ V AC voltage, it contains nearly 300 μ V DC component when it is transmitted to room temperature, which severely affects the room temperature measurement of small AC voltage.

In general normal temperature measurement, sometimes a twisted pair is also used, which is formed by twisting wires with diameters ranging from 0.4mm to 0.6mm, and is mainly applied to signal anti-interference transmission and effectively reduces crosstalk between wires, and the two main functions are as follows: the suppression of external interference signals is realized; and crosstalk between wires in the same cable is realized. The principle of the interference suppression of the twisted pair is that two wires are mutually wound together, and the total interference current generated on the twisted lead is 0 under the interference of external signals, so that the suppression of the external interference signals is realized; the principle of eliminating the mutual crosstalk between the leads is to utilize the twisted pair structure to make the electromagnetic wave radiated from one lead in transmission cancel out with the electromagnetic wave sent from the other lead, thereby effectively reducing the degree of signal interference between the wires. The most important thing for using twisted pair at normal temperature is to set up reasonable twist pitch to make total interference current be 0 so as to attain the goal of eliminating interference.

In the signal transmission process of the micro alternating current quantum voltage, the main problem to be solved is the influence of a direct current component signal generated by a temperature-crossing region, although the direct current component signal is also a twisted pair, and the design requirements and the effects of the conventional twisted pair used at single and normal temperature are different.

Disclosure of Invention

The invention aims to provide a novel twisted pair and a micro alternating current quantum voltage trans-temperature region transmission method.

In order to achieve the purpose, the invention provides the following scheme:

a novel twisted pair, said twisted pair comprising: the metal enameled wires are equal in length, and the two metal enameled wires are wrapped by the insulating sleeve after being uniformly wound.

Optionally, the metal enameled wire is a pure copper enameled wire.

Optionally, the diameters of the two pure copper enameled wires are equal.

Optionally, the diameter of the pure copper enameled wire is less than 0.2 mm.

Optionally, the insulating sleeve is a polytetrafluoroethylene sleeve.

A micro alternating current quantum voltage trans-temperature region transmission method is characterized in that a novel twisted pair is adopted to carry out trans-temperature region transmission on micro alternating current quantum voltage.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the novel twisted pair provided by the invention can be applied to trans-temperature-zone transmission of micro alternating current quantum voltage between low temperature and normal temperature, the lengths of two metal enameled wires of the twisted pair are equal, the influence of a lead direct-current component is reduced when the micro alternating current quantum voltage signal is transmitted in the trans-temperature zone of nearly 300 ℃, the influence on the measurement result of the micro alternating current voltage value is avoided, and the accurate measurement of the micro alternating current quantum voltage in the normal temperature zone is realized.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic diagram of a twisted pair cable according to the present invention;

FIG. 2 is a cross-sectional cut-away view of a twisted pair of the present invention;

1-insulating sleeve and 2-metal enameled wire.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The invention aims to provide a novel twisted pair, which reduces the influence of the twisted pair on the measurement result of the micro alternating voltage value.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, a schematic structural diagram of the novel twisted pair of the present invention includes: the metal enameled wire comprises two metal enameled wires 2 with the same length, wherein the two metal enameled wires 2 are wrapped by an insulating sleeve 1 after being uniformly wound. The insulating bushing 1 is preferably a teflon bushing. The metallic enamel wire 2 is preferably a pure copper enamel wire.

Fig. 2 is a cross-sectional view of a novel twisted pair, wherein two metal enameled wires 2 have the same diameter and are smaller than 0.2mm, and are used for reducing heat introduction at a 4K temperature region, and compared with a twisted pair conventionally used at normal temperature, the linear size of the twisted pair is in a range of 0.4 mm-0.6 mm, and the volatilization amount of liquid helium is reduced.

The twisted pair has no specific requirement on the lay length, and the most important design requirement is that the lengths of two leads must be equal to achieve the effect of reducing direct current components; the process of winding the wires can select manual winding or machine winding. Compared with the twisted pair which is conventionally used at normal temperature, the twisted pair has the advantage that the reasonable twisting pitch is set, so that the process difficulty is reduced.

The twisted pair conventionally used at normal temperature has the function of inhibiting external interference signals or offsetting mutual electromagnetic waves among the leads and reducing the degree of signal interference between the leads during signal transmission. The twisted pair in the scheme has the function of reducing the influence of direct current components of the lead when micro alternating current quantum voltage signals are transmitted in a temperature-crossing region of nearly 300 ℃. The two principles for reducing the interference effect are different.

The novel twisted pair can be applied to a micro alternating current quantum voltage temperature-crossing region transmission method, and according to the mechanism principle of the novel twisted pair, the influence of a direct current component generated in lead wire transmission is restrained, the influence of the direct current component generated at a lead wire end on the output micro alternating current quantum voltage signal when the micro alternating current quantum voltage is transmitted from a liquid helium temperature region to a room temperature region is reduced, the direct current component in the micro alternating current quantum voltage output signal can be reduced from 300 mu V to below 300nV, the measurement error of the micro alternating current voltage caused by the direct current component is reduced from 4% to below 0.01%, and the measurement result of the micro alternating current voltage value is basically not influenced, so that the measurement of the micro alternating current voltage at a normal temperature end is facilitated.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.