井下侧向多镜头成像系统的环形光源及其控制器设计与实现  

Design and implementation of the annular light source and its controller for downhole lateral multi-lens imaging system

作　　者：李周利[1] 任阿龙[1] 陈粲[2] 

机构地区：[1]西安石油大学电子工程学院,陕西西安710065 [2]哈尔滨工业大学智能测试及信息处理技术研究所,黑龙江哈尔滨150001

出　　处：《西安石油大学学报（自然科学版）》2011年第4期95-97,12,共3页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金项目(编号:60877011)

摘　　要：针对井下视频测井仪对于侧向井壁成像效果较差的问题,设计了一种环形光源及其控制器装置.光源由2个同轴、平行且关于成像平面上下对称放置的环形光源板组成.光源板与LED的光轴有一固定夹角α,使得照明范围在井壁上的投影关于成像平面上下对称,从而覆盖侧向成像区域,消除图像盲点.2个光源板采用不同波长的LED,可充分利用介质的光谱特性.每个光源板电路采用多个LED串并联连接,使用电压低,提高了可靠性.成像系统的控制芯片控制具有I2C接口的数字电位器,改变LED驱动芯片的输出电流,以控制光源强度.实验表明,所设计的环形光源及其控制器能够满足井下侧向多镜头成像系统对光源的要求.The current downhole video logging instrument can get the clear well bottom image,but the obtained well wall image is not ideal due to the restriction of its principle.The annular light source and its controller are designed for the downhole lateral multi-lens imaging system.The light source consists of two coaxial and parallel annular illuminant boards,and they locate symmetrically above and below imaging plane.There is a fixed angle between the plane of the boards and the optic axis light emitting diodes(LED),which makes have α,it can make the lighting projection of the light emitting diodes on well wall symmetric about the imaging plane So that the light covers all image area on the well wall and eliminates blind spots.The LEDs on two boards are of different light wavelength,which makes full use of the spectrum characteristics of medium.Each board circuit uses multiple LEDs in series and parallel manner to reduce its use voltage and improve its work reliability.The key chip of the imaging system controls the digital potentiometer with an I2C interface to change the output current of LED driver chip and control the light intensity of the light sources.The experimental result shows that the designed the annular light source and its controller can meet the requirements of downhole lateral multi-lens imaging system.

关 键 词：视频测井 环形光源 光强度控制 I2C协议 数字电位器 

分 类 号：TP631.83[自动化与计算机技术—控制理论与控制工程]