A Noise Thermometer with Four Channels Referenced by Quantum Voltage

A four-channel, thermometer technology, used in thermometers, thermometers with electrical/magnetic components directly sensitive to heat, measurement devices, etc., can solve the statistical averaging time to prolong the measurement time, the measurement circuit to limit the measurement level, and the inability to match the power at the same time. and impedance issues

Inactive Publication Date: 2017-01-25
NAT INST OF METROLOGY CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The statistical averaging time of two Johnson noise sources prolongs the measurement time, and the power and impedance cannot be matched between the two noise sources at the same time, and the nonlinearity of the measurement circuit limits the improvement of its measurement level

Method used

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  • A Noise Thermometer with Four Channels Referenced by Quantum Voltage
  • A Noise Thermometer with Four Channels Referenced by Quantum Voltage
  • A Noise Thermometer with Four Channels Referenced by Quantum Voltage

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Embodiment Construction

[0019] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0020] Such as figure 1 The schematic diagram of the four-channel noise thermometer shown includes a noise source 10 to be measured, a reference quantum voltage pseudo-noise source 11, a switch conversion circuit 12, a four-channel amplifying and filtering circuit 13, and a data acquisition and processing part 14. Among them, in the amplifying filter circuit 13, Preamp represents the preamplifier circuit, Buffer1 is the first-stage buffer circuit, and Buffer2 is the second-stage buffer circuit. Each amplifying and filtering circuit uses passive low-pass filter 1 and filter 2. Preferably, the two filters are both 11-order Butterworth low-pass filters, and the cut-off frequency of each filter is 800 kHz. Two high-order low-pass filters can quickly attenuate the high frequency signal aliased back by the ADC, and ensure that the aliased signal is at least 120dB lower th...

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Abstract

The invention relates to a four-channel noise thermometer with a quantum voltage as reference. The four-channel noise thermometer with the quantum voltage as the reference comprises a noise source to be measured, a reference quantum voltage pseudo noise source, and a switch change-over circuit which is connected with the noise source to the measured and the reference quantum voltage pseudo noise source. The four-channel noise thermometer with the quantum voltage as the reference is characterized in that a four-channel amplifying and filtering circuit is connected with a switch connecting circuit, and the four-channel amplifying and filtering circuit is correspondingly connected with a four-channel acquisition channel of a data acquisition and processing portion. The four-channel noise thermometer with the quantum voltage as the reference can effectively reduce integral time required by measurement, reduces system deviations and can play an enormous role in thermodynamic temperature and Boltzmann constant measurement studies.

Description

Technical field [0001] The invention belongs to the field of temperature measurement, and particularly relates to a four-channel noise thermometer with a quantum voltage as a reference. Background technique [0002] Temperature is a physical quantity that characterizes the degree of heat and cold of an object, and is the macroscopic manifestation of the intensity of thermal motion of a large number of microscopic particles. Many physical properties of substances are closely related to temperature. Therefore, accurate temperature measurement is of great significance to scientific experiments, industrial production and people's lives. [0003] The prerequisite for accurate temperature measurement is to establish a temperature scale. The temperature scale is a scale for digitizing temperature. It specifies a set of methods for temperature digitization and defines the unit of temperature. After the development of the temperature scale has gone through three historical stages, the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/30
Inventor 屈继峰付云丰周琨荔
Owner NAT INST OF METROLOGY CHINA
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