发光阈 meaning in English

luminescence threshold
threshold of luminescence

The simulating temperature values at collapse are almost equal to each other for different gas bubbles at the threshold pressures , however , when the pressure above the threshold one , the sl mechanism satisfies the bremsstrahlung
通过对含有单一氦、氩、氪的气泡进行声致发光阈值研究，发现随着气体原子质量的增加，气泡的声致发光阈值降低。
Results show that , at any frequency , the mbsl field changes with the ultrasonic intensity , and the thresholds of ultrasonic pressures are increased with the ultrasonic frequency . the reason is that , the ultrasound with higher frequency needs higher pressure to make the bubbles provide enough energy to dissociate the water molecules
超声的驱动频率的大小影响气泡的膨胀比(气泡在超声作用下膨胀的最大半径最小半径) ，进而影响气泡爆破时产生的温度，导致不同频率条件下气泡地声致发光阈值不同。