可见区 meaning in Chinese

visible range
visible region
visual field

If the range of frequencies being absorbed spreads across the visible, the object w ill appear black .
若被吸收的频率范围扩展到整个可见区，那么物体将呈现黑色。
The decrease may be due to washing out of fluoroprobe , but this was not an obstacle to its further use ; the quantitative information ( fo i f ) did not change significantly , where f0 and f are the fluorescence intensities in the absence and in the presence of oxygen , respectively
在现场测试中，光纤氧传感探头可直接进行溶解氧的原位监测。由于所使用的荧光分子探针的激发光谱在可见区范围，光源的体积得以减小，达到了实现整体仪器的微型化的目的。
The main content and important results of this thesis are as following : a series of er + - doped borosilicate glasses were prepared by varying the composition . absorption spectra of four glasses were measured . 1 . 51uminescence under the excitation of a 978nm ld and visible luminescence with a 488ar + laser were observed
测量了样品的吸收光谱，在978nmld低功率激发下，均观测到了系列玻璃样品中er ~ ( 3 + )的1 . 5 m近红外发射，在488nmar ~ +激光激发下，观测到了可见区发光。