久久无码高清,噜噜成人一区二区,美女视频一区播放,日韩三级一区二区入口

撥號(hào)18861759551

你的位置:首頁(yè) > 技術(shù)文章 > Edge-Blackening

技術(shù)文章

Edge-Blackening

技術(shù)文章

Edge-Blackening

How to Specify Edge Blackened Optics

Any of our lenses with a diameter of 5mm or greater can be specified with blackened edges. To specify the blackening, simply append a –INK to the BBAR coated stock number. For example, to order a 10mm diameter, 10mm focal length, VIS 0° coated DCX lens with blackened edges, the stock number would be #63-599-INK.

 

Stray Light

When integrating lenses into a multi-element system, a common limiting factor in overall performance is stray light. Stray light is energy outside of the clear aperture of an optical system that scatters off of the edges of an optical or mechanical component (Figure 1) and reaches the sensor in the form of noise (rather than signal). One successful method commonly used to reduce stray light within a system involves blackening the edges of the optics in the system.

 

Measuring BRDF

Scattered signals are typically quantified as scattered light power per unit solid angle, or inverse steradians. Scatter results are made more meaningful by normalizing the results by the intensity of light incident on the scatter source. This function is commonly referred to as the Bi-Directional Reflectance Distribution Function, or BRDF. A simplified equation of BRDF is the intensity ratio of reflected to incident light per solid angle. These measurements are taken by projecting a laser onto a surface at a fixed angle from the normal. A detector is then rotated about the point of scatter to record the change in irradiance as a function of angle (Figure 2).

Figure 1: Light reflected by an object outside FOV being scattered from the edges of a lens without edge blackening

Figure 2: Detector recording irradiance as a function of angle

 

Figure 3 compares the results of such a test between one surface coated with edge-blackening ink, and the other uncoated ground glass to simulate the edge of an optic. The plot indicates an order of magnitude improvement in stray light reduction by edge-blackening. This improvement potentially save the need for expensive mechanical system baffling. With the detector close to -90° from normal, the percent of incident light recorded is near zero due to the high angle of incidence. At -5° the percent of incident light recorded is also 0%, due to the detector eclipsing the source. At +5° there is a spike due to the specular reflection (angle of incidence is equal to angle of reflection). The percent of incident light recorded then approaches zero as the angle of the detector again approaches 90° to the normal.

Figure 3: BRDF Plot of unblackened and blackened lenses

 

Results

Figures 4 and 5 illustrate an irradiance profile taken from a sensor imaging a point source through a lens. Figure 4 was generated by a standard optic while Figure 5 was generated with an edge-blackened optic. The effect of stray light as illustrated in Figure 4 is a higher noise floor that in effect washes out the image resulting in lower image contrast.

Figure 4: Conventional Results — Line profile of the irradiance distribution through the center of an imaging sensor where the lens edges are not blackened

Figure 5: Edge-Blackened Results — Line profile of the irradiance distribution through the center of an imaging sensor where the lens edges are blackened

Edge-blackening, using RoHS compliant, solvent resistant ink is now available as a stock item for many Edmund lenses. Look for the INK suffix at the end of the stock number to indicate edge-blackening. In the case that it is not available as a stock item, edge blackening is also available through Optical Prototyping.

聯(lián)系我們

地址:江蘇省江陰市人民東路1091號(hào)1017室 傳真:0510-68836817 Email:sales@rympo.com
24小時(shí)在線(xiàn)客服,為您服務(wù)!

版權(quán)所有 © 2025 江陰韻翔光電技術(shù)有限公司 備案號(hào):蘇ICP備16003332號(hào)-1 技術(shù)支持:化工儀器網(wǎng) 管理登陸 GoogleSitemap

在線(xiàn)咨詢(xún)
QQ客服
QQ:17041053
電話(huà)咨詢(xún)
0510-68836815
關(guān)注微信
久久久久久69精品久久| 色 性 欧美 日韩| 国产欧美亚洲日韩一区二区| 国产精品性淫乱视频网站| 日本久久亚洲三区| 麻豆激情十区AV| 高清无码二区| 免费不卡的成人av| 日韩欧美99ww| 亚洲精品国产美女久久| 欧产 日产 国产蜜臀| 日本婷婷3p| 亚洲中文av在线观看不卡| 插下面在线播放| 葵司一区二区三区| 日韩欧美女同性恋| 丁香五月天成人黄色小说| 亚洲 欧美在线观看香蕉冰箱| 综合色站日本专区| 国产欧美韩日综日在线免费| 后入家庭人妻| 秋霞一区二区三区影视| 国产久热久热| 大美女大屁股艹大鸡巴| 一区二区三区四区性爱网| 久久福利视频有限公司| 国产日韩欧美图片国产日韩欧| 国产成人精品免费视频麻豆大全| 日韩一在线不卡| 一级黄片官网| 欧美一级美女视频| 91手机在线国产视频| 久色在线视屏| 国产黄色一级精品网站| 久久精品人妻少妇一区二区三区97 | 精品久久视| 久婷婷综合网| 日韩午夜欧美精品在线播放| 日韩另类小说在线阅读| 一级欧视频一级欧视频| 中文字幕在线日本乱码|