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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">告诉你选择红外热像仪的关键要素 </h1> <p class="xg1"> 时间：2016-4-18 15:14<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1919)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=4319&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>红外热像仪是利用红外探测器和光学成像物镜接受被测目标的红外辐射能量分布图形反映到红外探测器的光敏元件上，从而获得红外热像图，这种热像图与物体表面的热分布场相对应。通俗地讲红外热像仪就是将物体发出的不可 ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div>红外热像仪是利用红外探测器和光学成像物镜接受被测目标的红外辐射能量分布图形反映到红外探测器的光敏元件上，从而获得红外热像图，这种热像图与物体表面的热分布场相对应。通俗地讲红外热像仪就是将物体发出的不可见红外能量转变为可见的热图像。下面简单整理了八大要素供朋友们参考。</div><div style="text-align: center;"><p><a href="data/attachment/portal/201604/18/152105gpsddikw9ddpdr39.png" target="_blank"><img src="data/attachment/portal/201604/18/152105gpsddikw9ddpdr39.png.thumb.jpg"></a></p></div><div><b>一、像素</b></div><div><br></div><div>首先要确定购买红外热像仪的像素级别，大多红外热像仪的级别和像素有关。民用红外热像仪中相对高端的<a href="http://b.oecr.com/sell" target="_blank" class="relatedlink">产品</a>像素为640*480=307,200，此高端红外热像仪拍摄的红外图片清晰细腻，在12米处<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>的最小尺寸是0.5*0.5cm;中端红外热像仪的像素为320*240=76,800，在12米处测量的最小尺寸是1*1cm;低端红外热像仪的像素为160*120=19,200，在12米处测量的最小尺寸是2*2cm。可见像素越高所能拍摄目标的最小尺寸越小.</div><div style="text-align: center;"><p><br></p><p><a href="http://www.oecr.com/"><img src="data/attachment/portal/201604/18/171525oeqq0lqlqyflwqwq.png"></a></p><p><a href="http://www.oecr.com/"><img src="data/attachment/portal/201604/18/171526yket9jbzr9el9krr.png"></a></p><p><br></p></div><div><b>二、测温范围和被测物</b></div><div><br></div><div>根据被测物体的温度范围确定测温范围，来选择合适温度段的红外热像仪。目前市场上的红外热像仪大多会分成几个温度档，比如-40-120℃0-500℃，并不是温度档跨度越大越好，温度档的跨度小测温相对会更准确些。另外一般红外热像仪需要测量500℃以上的物体时，则需要配备相应的高温镜头。</div><div><br></div><div><b>三、温度分辨率</b></div><div><br></div><div>温度分辨率体现了一台红外热像仪的温度敏感性，温度分辨率越小红外热像仪对温度的变化感知越明显，选择时尽量选择此参数值小的产品。红外热像仪<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>被测物的主要目的是通过温度差异找出温度故障点，测量单个点的温度值并没有太大意义，主要是通过温度差异来找相对的热点，起到预维护的作用。</div><div><br></div><div><b>四、空间分辨率</b></div><div><br></div><div>简单来说，空间分辨率数值越小则空间分辨率越高，测温越准确，空间分辨率数值越小时，被测最小目标可以覆盖红外热像仪的像素，测试的温度即被测目标的真实温度。如果空间分辨率数值越大则空间分辨率越低，被测的最小目标不能完全覆盖红外热像仪的像素，测试目标就会受到其环境辐射的影响，测试温度是被测目标及其周围温度的平均温度，数值不够准确。</div><div><br></div><div>左图为高空间分辨率，被测点的温度更准确;右图空间分辨率低，测试温度为被测点及其周围环境温度的平均值，测温不准。</div><div><br></div><div><b>五、温度稳定性</b></div><div><br></div><div>红外热像仪的核心部件为红外探测器，目前主要有两种探测器，即氧化钒<a href="http://material.oecr.com" target="_blank" class="relatedlink">晶体</a>和多晶硅探测器。氧化钒探测器主要的优势是测温视域MFOV(MeasurementFieldofView)为1，温度测量是精确到1个像素点。AmorphousSilicon(多晶体硅)<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>器，MFOV为9，即每点的温度是基于3×3=9个像素点平均而获得。氧化钒探测器的温度稳定性好、寿命长，温度漂移小。</div><div><br></div><div>NIT公司是世界上唯一一家制造Pbse成像焦平面和非制冷中波红外成像系统的公司，其产品具有可靠性高，价格低，体积小重量轻、功耗低、易于设计便携式热成像系统，相比其他探测器，它的速度更快，帧频提高了10倍，实现了市场上非制冷传感器最快的探测速率，其应用范围广泛，如气体检测、工业过程控制、火焰检测、质量检测、红外光谱学、火焰特性等。</div><div><br></div><div><b>六、红外与可见光图像的组合功能</b></div><div><br></div><div>如果红外图像和可见光图像组合<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>就减少了大量工作，可根据可见光图片来判断红外图片中热点的未知，同时报告自动生成也会大大减少操作时间。</div><div style="text-align: center;"><p><a href="data/attachment/portal/201604/18/150456dctif2tl9utuktgf.jpg" target="_blank"><img src="data/attachment/portal/201604/18/150456dctif2tl9utuktgf.jpg"></a></p><p class="MsoNormal" style="text-align: center;"><span style="mso-spacerun:'yes';font-family:宋体;font-size:10.5000pt;mso-font-kerning:0.0000pt;">欢迎关注光电<a href="http://news.oecr.com" target="_blank" class="relatedlink">资讯</a>微信公众号，每天将由光电工程师<a href="http://club.oecr.com" target="_blank" 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