X 射线图像增强器具有出色的灵敏度,但它们存在图像失真,需要在图像测量中校正。对于 CCD,制造具有较大有效面积的设备非常困难。这对于大面积的 X 射线成像来说是一个缺点,因为与可见光不同,光学透镜不能用于聚焦 X 射线。而 a-Si 设备能够以大尺寸制造,但具有极长的衰减时间,这可能导致高速工作期间的图像延迟问题。为了解决这一切问题,平板传感器应运而生。通过结合 CMOS 技术,从而可以制造出尺寸在 a-Si 和 CCD 设备之间、同时又没有图像延迟问题的设备。下表比较了这些设备的规格。
X 射线成像设备 | 灵敏度 | 分辨率 | 影像尺寸 | 动态范围 | 性价比 | 变形 | 备注 |
---|---|---|---|---|---|---|---|
X 射线图像增强器 | 高 | 低 | 大 | 非常窄 | 良好 | 高 | 相机尺寸大 |
CCD | 良好 | 高 | 小 | 窄 | 低 | 低 | 难以生产大面积设备 |
a-Si | 低 | 低 | 非常大 | - | 低 | 低 | 衰减时间长且价格高 |
平板传感器 | 良好 | 良好 | 大 | 宽 | 高 | 低 | - |
我们的标准工艺在 100 × 100 μm 像素尺寸上实现了 87% 的高孔径比。
这是因为在软件提供外部触发器之前,平板传感器会积累电荷。因此,在测量期间需要排除第一帧。
尽管具体取决于平板传感器的类型,但通常需要准备帧抓取板或网络接口卡、信号电缆、电源和 PC 等。有关详细信息,请参阅数据单。
我们建议使用配备电源变压器的单调增加型串联电源。如果使用会产生高波纹噪声的开关电源,则采集的图像上可能会出现水平线噪声。与 DC/DC 转换器和 LDO 结合使用时,开关电源还可能会降低图像质量。使用在所用系统要求的允许范围内的低波纹噪声串联电源。
如果使用 RS422/LVDS 型平板传感器,则可以使用 National Instruments 的 Measurement & Automation Explorer (MAX) 和 NI IMAQ PCI-1424 抓取卡来评估基本功能。
平板传感器不随附软件。客户必须根据具体用途创建软件。
规格因具体类型而异,请参阅数据单了解详细信息。
除在图像捕获期间外,请将 X 射线剂量设置为可检测范围内的一个较低值或关闭 X 射线,以便平板传感器不会暴露于辐射。另一种有效的方法是使用脉冲 X 射线源。此外还建议根据环境温度和传感器温度的波动,定期采集暗图像和阴影图像进行图像校正。
我们在使用寿命测试中使用以下标准来确定寿命终点。
*灵敏度增幅大于最大输出的 12.5% (8192 LSB)
*灵敏度为初始值的 50% 或更低。
*线缺陷数量是规格值的两倍或更多。
我们有一个演示室可供客户使用。我们还将用客户发送给我们的样品采集 X 射线图像。演示设备也可借给客户。请联系我们的销售办事处。
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