UVTRON® 是一种仅对波长为 185 nm 至 260 nm (*1) 的紫外光敏感的传感器。
UVTRON® 具有高灵敏度和快速响应的特点,是检测火焰和放电情况的理想选择。
*1:代表镍(Ni)电极
UVTRON® 是一种仅对波长为 185 nm 至 260 nm (*1) 的紫外光敏感的传感器。
它具有高灵敏度,可检测紫外光,相比红外光系统/仪器和烟雾探测系统/仪器,其响应速度更快。
*1:适用于镍(Ni)电极
根据所需灵敏度和使用条件选择最佳 UVTRON® 型号。
请参阅特性和规格。
此传感器对火焰发出的紫外光敏感,因此无法检测香烟和线香等无焰燃烧 。
由于 UVTRON® 的特性,在使用中,火焰的大小略呈线性。因此,建议将 其用作检测紫外光存在与否的开关传感器,而非测量光强度的传感器。
是的,可以。
但,当 UVTRON® 传感器检测到紫外光时,就会放电并发出紫外光。因此,邻近的 UVTRON® 传感器可检测首个传感器发出的紫外光。设计多个传感器设置以便每个 UVTRON® 传感器不会对邻近的传感器造成光学干涉。
操作 UVTRON® 需要满足以下其中一项。
1.外部 CR 淬灭电路和直流高压电源
2.DC-DC 转换器型高压电源电路
在滨松集团,我们提供使用 DC-DC 转换器型高压电源电路的 UVTRON® 驱动电路 C10807 和 C10423。如果您想了解此产品的更多信息,请联系我们。
使用约 10 GΩ 的高阻抗万用表测量 UVTRON® 的电源电压。如果万用表的阻抗太低,则可能无法准确测量其电源电压,因为 UVTRON® 驱动电路的阻抗很高。
根据检查灯 L9657-03 的开关操作检查 UVTRON® 是否检测到紫外光。检查时,务必确保外部光源发出的紫外光不会进入 UVTRON® 传感器。
保修期为自交货之日起一年,传感器的保修期常为约五年。
长期储存后,检查传感器是否发生了任何劣变,如引脚生锈,然后再检查操作。这取决于传感器的储存方式,但一般而言,如果没有生锈等劣变,就应该可以正常操作传感器。
如果电源电压增加,则灵敏度将与增加的电压成比例增加。但,当电源电压超过推荐操作范围时,背景噪声 (BG) 就会增加,因此建议在推荐电源电压范围内使用传感器。
VL:紫外光下放电启动电压
VD:荧光灯下电极之间的介电击穿电压
当出现以下任何一种情况时,传感器的寿命即结束。
1.当放电启动电压达到规格中的最大值时
2.当灵敏度降至初始值的 50% 时
3.当背景噪声达到规格中的最大值时
R2868、R9454 和 R244 这三种传感器类型的引线可弯曲和切割。不得处理(切割或弯曲)任何其他传感器类型的引线。
将引线牢牢固定到位后,小心地弯曲引线,确保玻璃灯泡不会破裂或出现划痕。
通过切割处理引线时,可能会冲击内部电极。可能会使其电气特性劣化至与传感器掉落相同的程度。为减轻对内部电极的冲击,切割引线时使钳子的切割边缘垂直于内部电极。应使用钳子缓慢地剪断引线,分两三次进行,不可一次剪断所有引线。
焊接时过度加热 UVTRON® 引线可能会导致玻璃灯泡破裂或损坏内部电极。这将导致操作故障,因此焊接时务必格外小心。对于带硬针引线的传感器,建议使用我们提供的专用插座之一。将传感器直接焊接到印刷电路板上时,使用散热器镊子或类似工具夹住引线根部,以防止热量传导至 UVTRON® 传感器,然后在 350°C 或更低的温度下在 5 秒内完成焊接。避免使用焊锡槽。焊接完成后,务必用酒精等将助焊剂彻底擦拭干净。
关于传感器的安装方向,请参阅产品信息部分的视图特性。安装传感器时请参考此信息,以确保紫外光可以直接进入阴极(光阴极面)。
安装传感器时,对安装位置无限制。
只要连接一根阳极引线和一根阴极引线,传感器就能正常操作。
如果必须远离驱动电路安装 UVTRON®,且电缆电容超过 100 pF,则直接在 UVTRON® 阳极(25 mm 内)前插入限流电阻器 (RS: 4.7 kΩ)。
电缆的寄生电容越高,放电电流越大,越可能损坏电极。
产生背景噪声 (BG) 的原因包括以下几点:
1. 宇宙射线等辐射
当能量高于紫外光的辐射入射到阴极(光阴极面)时,会因光电效应而引发放电。鉴于难以完全阻止自然界中存在的宇宙射线等辐射的进入,因此需要使用信号处理电路将宇宙射线等辐射与来自检测目标的紫外光区分开来。
2.X 射线
当能量和穿透性高于紫外光的 X 射线入射到阴极(光阴极面)时,会因光电效应而引发放电。
3.静电
当带静电的物体靠近或接触 UVTRON® 时,高电场可能会离子化管中的气体分子,从而引发放电。
4.高电场、高磁场、强电磁波
在高电源电压条件下,阴极(光阴极面)的电场发光可能导致光电子跃迁,从而引发放电。
5.比日光更强的极高辐射强度的强光(如激光器和 LED 发出的光)
当辐射强度极高的强光入射到阴极(光阴极面)时,会因热电子发射及其他因素,导致背景噪声增加。
6.意外紫外光
虽然目标以外来源的紫外光对于 UVTRON® 来说是正常现象,但检测此类紫外光可能会导致设备发生故障。我们亦可将其视为一种背景噪声 (BG)。在日常生活中,紫外光也很常见。特别是在户外,UVTRON® 对意外来源的微弱紫外光做出反应,例如电弧焊产生的火花或电火花(火车受电弓产生的火花)。在安装并使用 UVTRON® 的区域采取足够的预防措施。
务必确保意外紫外光不会进入传感器。但,鉴于无法避免 UVTRON® 对宇宙射线的影响做出反应,建议使用可消除背景噪声 (BG) 的信号处理电路。我们的 UVTRON® 驱动电路 C10807 和 C10423 配备背景噪声 (BG) 消除功能。如果您想更改噪声消除级别,请联系我们。
此灯发出的紫外光强度类似于打火机的强度。
IEC62471“灯和光源系统/仪器的光生物安全”认为此灯无害。但,应避免长时间用肉眼直视此灯。
使用 UVTRON® 时,请务必使工作温度保持在规定的工作温度范围内,即 -40 ℃ 至 +125 ℃,工作湿度范围为 80 % 或更低。
在高温、低温、高湿环境下使用传感器时容易出现以下情况。
● 高温下使用传感器,劣化更快。
● 低温下使用传感器,紫外光下的放电启动电压(VL)下降,灵敏度提升。
● 高湿度下使用传感器,因电压泄漏和短路,导致不稳定操作。
如工作湿度超过 80%,请确保传感器上无水分形成。另外,请务必确保引线周围已经采取足够的绝缘措施,例如用绝缘树脂覆盖引线。
鉴于 UVTRON® 受到过度冲击可能会导致阳极和阴极相互接触,从而大大缩短其使用寿命。
如果玻璃灯泡脏了,则紫外光透射率会下降,可能导致玻璃劣化。将传感器安装到设备上后,定期用纱布或沾有酒精的清洁湿巾擦拭玻璃灯泡,使其保持清洁。操作 UVTRON® 时,请勿徒手触摸玻璃灯泡。请戴上手套,以防止手上的油污粘在玻璃灯泡上。
UVTRON® 传感器、插座、检查灯不在 CE 认证范围之内。但,UVTRON® 驱动电路、检查灯驱动电路、模块符合 CE 认证要求。
所有这些产品均符合 RoHS 指令。
有关 REACH 法规的信息,请联系我们。
我们提供免费的演示设备供您试用。请随时联系我们获取更多信息。
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