Method and apparatus for limiting optical radiation intensity at an
optical sensor using solid particles oscillating in an electric field
    3.
    发明授权
    Method and apparatus for limiting optical radiation intensity at an optical sensor using solid particles oscillating in an electric field 失效
    使用在电场中振荡的固体颗粒来限制光学传感器处的光辐射强度的方法和装置

    公开(公告)号:US5280169A

    公开(公告)日:1994-01-18

    申请号:US995200

    申请日:1992-12-22

    CPC分类号: G02F1/17 G02B5/23

    摘要: Method and apparatus for limiting optical radiation to an optical sensor are disclosed for protecting the sensor against damage from high intensity optical radiation. A fixed electric field is established between a pair of spaced electrodes by connection of the electrodes to a DC voltage source. Small solid particles oscillate back and forth in the electric field between the electrodes. Incident optical radiation is focused at a focal plane at the oscillating solid particles, and energy transmitted through the oscillating particles is focused at the optical sensor. The transmittance of the particle-containing space is substantially constant for incident optical radiation intensity up to a threshold level below which the sensor is undamaged by the radiation. Above the threshold, oscillating particles are heated to a high temperature for vaporization, ionization and thermal expansion thereof for increased scatter and absorption thereby limiting optical radiation to the sensor to an intensity below which damage to the sensor occurs.

    摘要翻译: 公开了用于将光辐射限制到光学传感器的方法和装置,用于保护传感器免受高强度光辐射的损害。 通过将电极连接到DC电压源,在一对间隔的电极之间建立固定的电场。 小固体颗粒在电极之间的电场中来回振荡。 入射光辐射聚焦在振荡固体颗粒的焦平面处,透过振荡粒子的能量聚焦在光学传感器处。 对于入射光辐射强度直到阈值水平以下,含有颗粒的空间的透射率基本上是恒定的,在该阈值水平以下,传感器不被辐射损坏。 高于阈值时,振荡颗粒被加热到高温以进行蒸发,电离和热膨胀,以增加散射和吸收,从而将光学辐射限制到传感器到低于传感器损坏的强度。