|Table of Contents|

Multi-channel high precision platinum resistance temperature measuring circuit for cryogenic test(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年03期
Page:
96-102
Research Field:
测控与试验
Publishing date:

Info

Title:
Multi-channel high precision platinum resistance temperature measuring circuit for cryogenic test
Author(s):
LING Sirui;  ZHANG Wei
(Beijing Institute of Aerospace Testing Technology, Beijing 100074,China)
Keywords:
temperature measurement circuit;  multi-channel;  ratiometric measurement;  cryogenic test;  platinum resistor
PACS:
TH811
DOI:
-
Abstract:
In cryogenic test like cryogenic propellant boil-off control test, a large number of high-precision temperature measuring points are required. As such, issues of conditioning-circuit deployment and its cost, for the purpose of multi-channel measuring and disabling ineffective points, are most pronounced. For this reason, a multi-channel platinum resistance temperature measuring circuit for cryogenic test was realized here. A current source, an amplifying and filtering circuit and an interacting channel control system based on ATMega328P and serial screen were designed. Multiple platinum resistors for measurement were connected in series with a known reference resistor. All resistors were driven by a current source. The influence of current source performance on accuracy was eliminated by comparative measurement. Error analysis and experiments proved that the resistance measuring accuracy is 0.05%. The system can be widely used in cryogenic measurement systems in laboratory and testing field

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Last Update: 2020-06-25