近红外光谱分析作为石油勘探过程中油品成分鉴别的一种重要手段,多年来引起人们的广泛关注和深入研究。针对石油勘探过程中油藏井温度高、空间局促等苛刻环境条件,研制了一种能够在高温环境中连续稳定工作的实用化微型近红外光谱分析仪,其体积为154mm×66.5mm×38mm。该微型近红外光谱分析仪采用凹面光栅作为分光元件,针对油气特征波段进行理论计算和Zemax软件仿真,设计出通量高、杂散光少、成像优质的全息凹面光栅。探测器选用Hamamatsu公司二级半导体制冷线阵电荷耦合器件(CCD),通过合理的光路设计和紧凑的结构布局,实现了在70℃的高温环境下稳定工作。通过标定及相关性能测试,结果表明:该微型近红外光谱分析仪光谱范围达到1550~1890nm,分辨率优于4.8nm,波长准确性±1.1nm,信噪比1202…1;利用该光谱分析仪对0#柴油和水的吸光度进行了应用实验,结果充分证明该系统的实用化水平。 Near-infrared spectroscopy as an important means of oil composition identification in petroleum exploration has attracted wide attention and in-depth research for many years. Aiming at the harsh environment conditions such as high temperature and space crater in the oil exploration process, a practical miniature NIR spectrometer capable of continuous and stable operation in high temperature environment was developed. Its volume is 154mm × 66.5mm × 38mm. The miniature NIR spectrometer uses a concave grating as a light splitting element, and theoretical calculations and Zemax software simulations are carried out for the characteristic bands of oil and gas to design a holographic concave grating with high flux, less stray light and high image quality. Hamamatsu detectors used two semiconductor refrigeration linear array charge-coupled device (CCD), through a reasonable optical design and compact structure layout, to achieve a stable operation at 70 ℃ in high temperature environment. Through the calibration and related performance tests, the results show that: the spectral range of the miniature near-infrared spectrometer reaches 1550-1890nm, the resolution is better than 4.8nm, the wavelength accuracy is ± 1.1nm and the signal-to-noise ratio is 1202 ... 1; The experiment on the absorbance of 0 # diesel oil and water was carried out. The results fully proved the practical level of this system.