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    • 4. 发明公开
    • Electro-optical windshield moisture sensing
    • ElektrooptischesAbfühlenvon Feuchtigkeit auf Windschutzscheiben。
    • EP0299606A1
    • 1989-01-18
    • EP88304708.6
    • 1988-05-25
    • Hochstein, Peter A.
    • Hochstein, Peter A.
    • B60S1/08
    • B60S1/0822B32B17/10036B32B17/10651B32B17/10761B60S1/0837G01N2201/0813Y10S15/15
    • The invention is a moisture sensor which includes an emitter (18) to emit pulses of radiant energy toward the inside surface (14) of a window (12) at an incident angle (9). The radiant energy is refracted into the window (12) at the air-inside window surface (14) and reflected off the air-­outside window surface (16) back through the window (12). The radiant energy is then detected by a detector (20) at a reflection angle (ϑ′) equal to the incident angle (ϑ). A support (22) spaces the emitter (18) and detector (20) a distance D betveen the intersection (I) of the axis (A) of the emitter (18) with the inside window surface (14) and the intersection (E) of the axis (B) oi the detector (20) with the inside window surface (14) which is determined by the formula:

      D = 2 T cos ϑ(n² - cos² ϑ)⁻ 1/2

      The detector (20) includes a collimator (36) to prevent non-parallel radiant energy from entering the detector (20) and an optical filter (40) to filter out radiant energy wavelengths below a predetermined wavelength in order to detect the emitted radiant energy.
    • 本发明是一种湿度传感器,其包括以入射角(9)朝向窗口(12)的内表面(14)发射辐射能的脉冲的发射器(18)。 辐射能量在空气内窗表面(14)处折射到窗口(12)中,并通过窗口(12)从空气外表面(16)反射回。 然后由检测器(20)以等于入射角(θ)的反射角(θmin)检测辐射能。 支撑件(22)将发射器(18)和发射器(18)的轴线(A)的交点(I)与内侧窗口表面(14)和交点(E)之间的距离D设置在发射器(18)和检测器(20) 检测器(20)的轴线(B)的内部窗口表面(14)由下式确定:D = 2 Tcosθ(n 2 - cosθ2) 检测器(20)包括准直器(36),用于防止不平行的辐射能量进入检测器(20)和滤光器(40)以过滤低于预定波长的辐射能量波长,以便检测 发射的辐射能量。