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介绍一种刑侦用多波段激光物证搜索仪,采用半导体激光器光源,可以实现五种波段激光输出:445nm蓝光、532nm绿光、635nm红光、白光、蓝绿混合光,主激发波长激光带宽窄至2nm。该物证搜索仪结合激光器光纯度和多波段光源的多功能性,通过选择激光波长,可以获得一个更好的机会降低背景荧光,提高物证和客体表面的反差,显现效果明显优于多波段光源,在无损物证荧光检查等刑侦领域有广泛的应用前景。
A multi-band laser evidence search device for criminal investigation is introduced. The semiconductor laser light source can realize laser output of five wavelength bands: 445nm blue light, 532nm green light, 635nm red light, white light and blue-green mixed light. The laser bandwidth of the main excitation wavelength is narrow 2nm. By combining the laser light purity and the versatility of the multi-band light source, the evidence search engine can obtain a better opportunity to reduce the background fluorescence and improve the contrast between the object evidence and the object surface by selecting the laser wavelength. The apparent effect is obviously better than the multi-band light source, In the non-destructive evidence such as fluorescence detection criminal investigation has a wide range of applications.