Dual-purpose calibration system for optical pressure sensitive paint considering static and sinusoidal pressure changes, and calibration method

A dual-purpose calibration system for an optical pressure sensitive paint considering static and sinusoidal pressure changes, comprising:

• a dual-purpose calibration tube, comprising a hollow tubular main body section, which is arranged at the bottom with a bottom cap in sealed connection with the hollow tubular main body section, the bottom cap being provided with a calibration sample located inside the hollow tubular main body section, the calibration sample being coated with an optical pressure sensitive paint, the bottom cap being also provided with a pressure transducer for detecting the pressure in the hollow tubular main body section and a temperature transducer for measuring the temperature of the optical pressure sensitive paint, and the bottom cap being sleeved with a heating device outside, wherein the hollow tubular main body section is provided with two transparent windows laterally;
• a sound source, configured to provide a dynamic pressure in the form of a sound wave during a dynamic calibration mode;
• a dynamic adapter, configured for sealed connection between the sound source and a front portion of the hollow tubular main body section during the dynamic calibration mode, the hollow tubular main body section and the dynamic adapter forming a standing wave tube with a total length that allows the sound wave emitted by the sound source to form a standing wave in the standing wave tube;
• a gas source, configured to supply gas during a static calibration mode;
• a static adapter, configured for a sealed connection between the gas source and the front portion of the hollow tubular main body section during the static calibration mode, so that the gas provided by the gas source is introduced into the dual-purpose calibration tube to form a pressure;
• a laser source, configured to emit a laser during the dynamic calibration mode and the static calibration mode, and irradiate the laser on the calibration sample through one of the transparent windows, so that the optical pressure sensitive paint on the calibration sample generates an excited light;
• a photoelectric conversion unit, configured to receive the excited light from the other transparent window during the dynamic calibration mode and the static calibration mode respectively, and convert the excited light into an electrical signal;
• and
• a controller, configured to acquire a real-time pressure in the dual-purpose calibration tube through the pressure transducer, identify an intensity of the excited light of the optical pressure sensitive paint through the photoelectric conversion unit, control a change of frequency of the sound source and a heating degree of the heating device during the dynamic calibration mode, and control an amount of gas provided by the gas source and the heating degree of the heating device during the static calibration mode, to obtain the intensity of the excited light under different working conditions.