A study of a wide range (1-600 kPa) static calibration method for pressure sensitive paints
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摘要: 压力敏感涂料PSP是一种先进的光学测试技术。涂料的标定误差是该技术的主要误差来源之一。压敏漆的测量范围正逐步从常规压力区间向超低压和超高压拓展，因此需要开发压力调节范围大、精度高的标定系统。本文将现有的变压力法和变浓度法相结合，提出了一种新型的PSP宽域压力标定方法及系统。通过理论计算的方式，分析了该系统与ISSI公司的商用PSP标定系统的性能差异。结果表明：PSP宽域压力标定系统在低压区（1~20 kPa）标定误差能够控制在0.5 kPa范围内，性能优于ISSI标定系统；中压区（20~200 kPa）与ISSI标定系统性能趋同，误差在4%以内，且随着压力增大，误差降低；高压区（200~600 kPa）可以弥补ISSI无法标定400 kPa以上范围的不足，能实现超高压环境中的PSP标定。本文还对最常用的两种快响应PSP进行了标定实验，结果表明：本文提出的系统标定精度高，能实现PSP宽域标定。Abstract: Pressure sensitive paint is an advanced optical testing technology. The calibration error of paint is one of the main error sources of this technology. The measuring range of pressure sensitive paint is gradually expanding from the conventional pressure range to ultra-low pressure and ultra-high pressure. Therefore, it is necessary to develop a calibration system with a large pressure adjustment range and high precision. A new PSP wide range pressure calibration method and system are proposed by combining the existing method of variable pressure with the method of variable concentration. The performance difference between this system and ISSI's commercial calibration system is studied by theoretical calculation. The results show that the calibration error of the PSP wide range pressure calibration system in the low-pressure area (1-20 kPa) can be controlled within 0.5 kPa, and its performance is better than that of the ISSI calibration system. In the medium-pressure area (20-200 kPa), the error of this system is under 4%, which is close to that of the ISSI calibration system, and the error decreases with the increase of pressure. In the high-pressure area (200-600 kPa), it has a broader calibration range and can realize the calibration of PSP in an ultra-high-pressure environment (400-600 kPa). This paper also carried out calibration tests on the two most commonly used quick response PSPs. The results show that proposed system has high calibration accuracy and can realize the wide range calibration of PSP.
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图 11 标定压力精度提高方案研究
Figure 11. Research on improving the accuracy of calibration pressure
图 12 PC PSP低压区的标定测量结果
Figure 12. PC PSP calibration measurement results in low-pressure area
图 13 MP PSP低压区的标定测量结果
Figure 13. MP PSP calibration measurement results in low-pressure area
图 14 PC PSP中压区的标定测量结果
Figure 14. PC PSP calibration measurement results in middle-pressure area
图 15 MP PSP中压区的标定测量结果
Figure 15. MP PSP calibration measurement results in middle-pressure area
图 16 PC PSP高压区的标定测量结果
Figure 16. PC PSP calibration measurement results in high-pressure area
图 17 MP PSP高压区的标定测量结果
Figure 17. MP PSP calibration measurement results in high-pressure area
表 1 压力等效换算表
Table 1. Pressure equivalent conversion table
压力区 压力范围 氧分压范围 氧气浓度 标定腔内总压 氧气浓度误差 低压段 1~20 kPa 0.2~4.0 kPa 保持2% 10~200 kPa 小于读数的1% 中压段 20~200 kPa 4.0~40.0 kPa 保持21% 20~200 kPa - 高压段 200~600 kPa 40.0~120.0 kPa 保持70% 57~171 kPa 小于读数的1% 
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