New high-frequency MJTCs of novel design on fused silica substrates

Lipe, Thomas E.; Kinard, J.R.; Novotny, Donald B.

doi:10.1109/cpem.2012.6250989

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…(2) The thermoelectric transfer difference is reduced from 2.8 × 10 −6 ∼ 9.1 × 10 −6 to 1.1 × 10 −6 ∼ 5.4 × 10 −6 at a frequency range of 10 2 ∼ 10 4 Hz. (3) The greater distance between the micro-bridge resonator and the heater increases the time constant, reduces the ac-dc transfer difference at low frequencies and reduces the coupling capacitance between the heater and the temperature sensor. Further optimization of the device structure is underway and will be reported in the future.…”

Section: Discussionmentioning

confidence: 99%

“…The most accurate method for transferring alternating voltage or current to the equivalent DC quantity is using thermal converters (TCs) [1][2][3]. They can be divided into four types: singlejunction thermal converters (SJTCs) [4], 3D multi-junction thermal converters (3D MJTCs) [5], thin-film (or planar) thermal converters (FMJTCs) [6][7][8][9][10] and semiconductor root mean square (RMS) sensors [11].…”

Section: Introductionmentioning

confidence: 99%

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Metrology and Measurement Systems

Dong¹,

Han²,

Zhang³

et al. 2018

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This paper presents the design, fabrication and testing of an improved thin-film thermal converter based on an electro-thermally excited and piezo-resistively detected micro-bridge resonator. The resonant thermal converter comprises a bifilar heater and an opposing micro-bridge resonator. When the micro-bridge resonator absorbs the radiant heat from the heater, its axial strain changes, then its resonant frequency follows. Therefore the alternating voltage or current can be transferred to the equivalent DC quantity. A non-contact temperature sensing mechanism eliminates heat loss from thermopiles and reduces coupling capacitance between the temperature sensor and the heater compared with traditional thin-film thermal converters based on thermopiles. In addition, the quasi-digital output of the resonant thin-film thermal converter eliminates such problems as intensity fluctuations associated with analogue signals output by traditional thin-film thermal converters. Using the fast-reversed DC (FRDC) method, the thermoelectric transfer difference, which determines the frequency-independent part of the ac-dc transfer difference, is evaluated to be as low as 1.1 • 10 −6 . It indicates that the non-contact temperature sensing mechanism is a feasible method to develop a high-performance thermal converter.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Dong¹,

Han²,

Zhang³

et al. 2018

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“…The literature on the methods for constructing thermal converters, such as single-junction thermal converters (SJTCs), conventional wire multijunction thermal converters (MJTCs), and thin-film (Planar) MJTCs (TFMJTCs), is voluminous [4]- [9]. The development of thermal converters has been one of the main interests in research on ac-dc transfer standards.…”

Section: Fabrication Of Thin Film Multijunction Thermal Converters Wimentioning

confidence: 99%

Fabrication of Thin Film Multijunction Thermal Converters With Improved Long-Term Stability

Fujiki

Amagai

Shimizume³

et al. 2015

IEEE Trans. Instrum. Meas.

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To increase the long-term stability of thin-film multijunction thermal converters (TFMJTCs) developed by the National Metrology Institute of Japan and Nikkohm Corporation Ltd., we prevented their degradation by improving the design and fabrication process. Judging from the Arrhenius model experiments, we successfully increased the lifetime of a renewed TFMJTC to more than 20 years by improving the deposition pattern of a Bi-Sb-Cu-based thin-film thermopile. We also evaluated the thermoelectric effect of the renewed TFMJTCs by the fast-reversed dc method. The low thermoelectric effect of less than 0.1 µV/V has been realized, which is comparable with that of high-quality multijunction thermal converters previously produced by other national metrology institutes.Index Terms-AC voltage standard, ac-dc transfer difference, long-term stability, thermal converter, thermocouple, thin film.

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“…The traveling standard was a type 6002A PMJTC, designed and manufactured by NIST [7]. The nominal input voltage of this TVC is U N = 3 V and the nominal resistance of the heater is 600 Ω.…”

Section: Traveling Standardmentioning

confidence: 99%

“…DC voltage of both polarities and AC voltage is applied alternately to both thermal converters by use of an automated switch box in a predetermined sequence, AC, DC+, AC, DC-, AC. For measurements at frequencies above 1 MHz two VSL type SJTCs [17] and one NIST type 6002 MJTC [7] are used. Measurements at frequencies above 1 MHz are carried out relative to 1 kHz by use of a fully automated twochannel set-up, including an AC voltage source and two highresolution DMMs.…”

Section: Trescal (Denmark)mentioning

confidence: 99%