基于近红外CMOS的激光光斑质心检测系统设计

王雪松

基于近红外CMOS的激光光斑质心检测系统设计

王雪松

北京高普乐光电科技股份公司，北京 100193

详细信息

作者简介:
王雪松（1984-），男，天津人，硕士，主要从事远距离激光夜视系统研发与设计。E-mail：wangxuesong@glopro.com.cn

中图分类号: TN219
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- 文章访问数: 322
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-17
- 修回日期: 2021-01-19
- 刊出日期: 2021-08-20

Design of a Laser Spot Centroid Detection System Based on NIR CMOS

WANG Xuesong

Beijing Glopro Optoelectronic Technology Co. Ltd., Beijing 100193, China

摘要

摘要: 为实现在复杂背景光照条件下具有较高的光斑探测灵敏度，高精度的坐标计算，及大于1000 fps的结果输出速度，介绍了一种基于近红外CMOS图像传感器，实时计算光斑质心坐标并输出的系统。设计使用安森美半导体公司的Python1300系列近红外图像传感器NOIP1FN1300A对激光光斑成像。利用Cyclone4系列低功耗FPGA对传感器进行驱动和解串，应用可靠的质心算法实时计算光斑坐标。结果输出部分分别采用USB2.0和RS422接口实时输出目标图像和质心坐标。该设计最终具有1500 fps的实时处理能力，软件代码简洁，质心坐标计算精确，系统功耗低等优点。
- 图像传感器 /
- FPGA /
- 近红外 /
- 质心坐标
Abstract: To meet the requirements of high detection sensitivity, high-precision calculation of spot coordinates, and a calculated output speed greater than 1000 fps, this study introduces a system based on a near-infrared CMOS image sensor to calculate and output centroid coordinates in real time. We employed the NIR detector NOIP1FN1300A of the Python1300 series produced by the company ONsemiconductor to image the laser spot. The Cyclone4 series low-power FPGA was used to drive the sensor and deserialize the sensor output data, and a reliable centroid algorithm was used to calculate the spot coordinates. The results in the output part, USB2.0, and RS422 interfaces were used to output the target image and centroid coordinates in real time. The design has the following advantageous features: 1500 fps real-time processing capacity, a concise software code, accurate calculation of centroid coordinates, and low-power consumption.
- image sensor /
- FPGA /
- near-infrared /
- spot coordinates

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图 1 硬件系统框图

Figure 1. Block diagram of hardware system

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图 2 LT1763应用电路

Figure 2. Application circuit of LT1763

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图 3 FPGA编程流程图

Figure 3. The flow chart of FPGA algorithm

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图 4 传感器上电时序

Figure 4. Power up sequence of sensor

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图 5 传感器状态码输出

Figure 5. Sync code output of sensor

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图 6 复杂背景灰度图

Figure 6. Gray scale in complex background

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图 7 光斑成像效果

Figure 7. Image of spot

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图 8 左下角光斑

Figure 8. Spot in the lower left corner of the image

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表 1 NOIP1FN1300A传感器性能

Table 1. Performance of NOIP1FN1300A sensor

Resolution	1280×1024
Pixel size	4.8μm×4.8μm
Frame rate	210/165fps@SXGA（ZROT/NROT）
815/545fps@VGA（ZROT/NROT）
Analog-to-digital converter(ADC)	10-bit
Configuration interface	SPI
Output format	4 LVDS data channels
Power supply	3.3V and 1.8V
Dark temporal noise	< 9e-（Normal ROT，1× gain）
Dark signal	5e-/s，0.5LSB10/s @20℃
Clock rate	Master clock 72MHz Max
	LVDS clock 360MHz Max
	LVDS data rate 720Mbps Max

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表 2 坐标输出结果

Table 2. Coordinate output

	X-axis	Y-axis
1	1196.36	147.12
2	1196.36	147.13
3	1196.36	147.12
4	1196.35	147.12
5	1196.36	147.12
6	1196.35	147.13
7	1196.35	147.13
8	1196.35	147.12
9	1196.36	147.13
10	1196.36	147.12

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参考文献(9)

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