迷你摄像机VCSEL补光解决方案——双目活体人脸识别摄像头

　　VCSELs as Supplementary Lighting in Mini-Binocular-Camera for Living Facial Recognition

　　双目活体人脸识别摄像头采用近红外补光技术，能实时精确捕捉活体人脸特征，有效防止将图片、屏幕视频等误认为真人活体。已广泛应用于驾驶员疲劳驾驶行为识别、ATM刷脸取款、高铁/收费站/机场等安检闸机自助通关、公司门禁考勤、新零售无人商店人脸比对/自助支付等诸多领域。

　　The binocular living facial recognitioncamera uses near-infrared as supplementary lighting technology, which can accurately capture the characteristics of living faces in real time, effectively preventing pictures, screen videos, etc. mistaken as real people. It has been widely used in fatigue driving behavior recognition, ATM face-scanning withdrawal, security gates in self-service customs clearances such as high-speed rail / toll gate / airport, company access control attendance, new unmanned retail store, self-service payment and many other fields.

　　常用的双目活体检测摄像机

　　Commonly used binocular live detection cameras

　　主动补光方案采用3-4颗高功率大角度LED（~3W，120°或90°），此方案灯珠成本高，数量多，体积大，功耗大，光功率密度低等，成为客户的痛点。

　　Active supplement lighting solution uses 3-4pcs high-power and wide-FOV LEDs (e.g. 3W, 120 ° or 90 °). However, the solution is with higher power consumption, lower optical power density, multiple LEDs with big size, and relatively higher costs. To replace LEDs with high-efficiency VCSELS can eliminate these pain points of our customers.

　　新亮光子自主研发的VCSEL激光器相比于LED优势

　　Brightlaser VCSEL’s advantages over LED

　　基于以上对比，新亮光子提供单颗VCSEL带微光学元件实现光学变换，与摄像机镜头的视场角匹配，不浪费光能，达到低功耗的效果，提高了产品的可靠性。示意图最左边是基板，将VCSEL激光二极管贴片在氮化铝（AlN）基板或铜镀银（Cu/Ag）基板上，基板帮助散热，再将基板用导热胶和散热片或者金属外壳保持好的热传导；在VCSEL二极管上封装了可以过260℃回流焊的微光学元件，微光原件能够实现出光的角度和光强均匀分布，这样就实现了小体积的照明光源。新亮光子单颗VCSEL+微光学元件体积小（高度1.4mm），效率高，光强分布均匀，单色性好，节省功耗同时节省空间，大大降低客户成本.

　　Based on the above comparison, Brightlaser provides device packaged with VCSEL and micro-optical elements, which can match camera lens’ FOV, with low-loss optical power, improved product reliability. The image on the far left is the substrate, by mounting VCSEL laser diode on the AIN substrate or the Cu/Ag substrate helps it to dissipate heat, then use substrate, thermal conductive gel, and heat sink/metal shell to maintain good heat transfer. A micro-optic component that can stand a reflow soldering of above 260℃ is implemented on the VCSEL laser diode, which can be used to evenly distribute beam divergence and light intensity, hence realizing a lighting source of low volume. Brightlaser offers a singular VCSEL+ micro-optic component that has low volume (height 1.4mm), high efficiency, even distribution of light intensity, good monochromacy, saving both energy and space, which largely lowers the cost for our customers.

　　方案：新亮光子VCSEL+微光学元件的示意图

　　As shown in the schematics, VCSEL laser Chip is placed on an aluminum nitride (AlN) substrate or a copper / silver-plated (Cu / Ag) substrate, which helps to dissipate heat. VCSEL diode packaged with micro-optical components can achieve a uniform distribution of light angle and light intensity. Brightlaser VCSEL + micro-optical element is compact, small size (height 1.4mm), high efficiency, good monochromaticity, lower power consumption, and cost-effective. It is ideal illumination light source.

　　应用案例

　　Case Study

　　照射距离超过3m，测试距离达到1.9m（客户要求1.5m左右），摄像机镜头焦距4mm，视场角70°x40°，采用72°x58°的VCSEL二极管，光功率200mW，人脸识别效果好。从下图可以看出，人脸的轮廓非常清晰，人脸边缘锐利。

　　The irradiation distance exceeds 3 meters, testing distance reaches 1.9 meters (longer than customer required 1.5 meters), the camera lens focal length is 4mm, FOV is 70 ° x40 °; then a VCSEL diode of 72 ° x58 ° with optical power of 200mW is used, resulting in good face recognition effect. As can be seen from the figure below, the outline of the face is very clear, and the edges of the face are sharp.

　　光强分布均匀 Face image is clear

　　Uniform distribution of light intensity

　　新亮光子提供多种贴片式红外VCSEL补光光源（详见下面列表案），满足多种出光角度（有60°x 45°, 72°x 58°，90°x 70°，120°x 85°，120°x 90°）。

　　Brightlaser provides a variety of SMD infrared VCSEL supplementary light sources (see the list below for details), satisfying various types of beam divergence (60 ° x 45 °, 72 ° x 58 °, 90 ° x 70 °, 110 ° x 85 °, 120 ° x 90 °).

　　以及不同距离的补光需求，比如0~2m，0~10m，0~20m。波长包括808nm，850nm和940nm。

　　And the need for supplementary light at different distances, such as 0 ~ 2m, 0 ~ 10m and 0 ~ 20m. Wavelengths include 808nm, 850nm and 940nm.

　　新亮光子VCSEL的特点是工作温度范围宽，可靠性高，调制频率高，都可以达到100MHz或者以上；同时封装PD和VCSEL一起，既可以检测diffuser是否脱落，也可以作为控制VCSEL光功率恒定输出的反馈信号。型号列表如下:

　　The characteristics of Brightlaser VCSEL are wide operating temperature range, high reliability, and high modulation frequency, which can reach 100MHz or above; PD and VCSEL are packaged together, which can detect whether the diffuser falls off, and can also be used to control the VCSEL optical power constant transmit Feedback signals. The model list is as follows: