Four-channel noise thermometer with quantum voltage as reference

A four-channel, thermometer technology, applied to thermometers, thermometers with directly heat-sensitive electric/magnetic elements, measuring devices, etc., can solve the problem of inability to match power and impedance at the same time, limit the measurement level of the measurement circuit, and prolong the statistical average time Measuring time etc.

Inactive Publication Date: 2014-03-26
NAT INST OF METROLOGY CHINA
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  • Abstract
  • Description
  • Claims
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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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  • Four-channel noise thermometer with quantum voltage as reference
  • Four-channel noise thermometer with quantum voltage as reference
  • Four-channel noise thermometer with quantum voltage as reference

Examples

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Embodiment Construction

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

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

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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, in particular to a four-channel noise thermometer with quantum voltage as a reference. Background technique [0002] Temperature is a physical quantity that characterizes the degree of hot or cold of an object, and it is a macroscopic manifestation of the intensity of thermal motion of a large number of microscopic particles. Many physical properties of matter are closely related to temperature, so accurate temperature measurement is of great significance for scientific experiments, industrial production and people's lives. [0003] The premise of accurate temperature measurement is to establish a temperature scale. A temperature scale is a scale that digitizes temperature. It specifies a set of methods for digitizing temperature and defines the unit of temperature. After the development of the temperature scale has gone through three historical stages, it is currently the international pr...

Claims

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Application Information

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Patent Type & Authority Applications(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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