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1. 发明授权

US4786176A Metrological apparatus and method using polarization modulation 失效
标题翻译：使用偏振调制的计量装置和方法
公开(公告)号：US4786176A
公开(公告)日：1988-11-22
申请号：US895
申请日：1987-01-06
申请人： Keith D. Froome
发明人： Keith D. Froome
IPC分类号： G01S7/481 , G01S7/499 , G01S17/08 , G01B11/14 , G01C3/00
CPC分类号： G01S7/4812 , G01S17/08 , G01S7/4972 , G01S7/499
摘要： To measure distances, light from a flash tube is plane polarized by a polarizing filter, then polarization modulated by an electro-optical crystal, then passed along a `wobbling` light path, then subjected to a relative retardation of about a quarter wavelength by a rhomb and then passed through a calibrated variable light path before being projected to a distant target reflector. The reflected light returns along the same path and is detected by a photomultiplier after passing through the polarizing filter. Adjustment of the variable light path until a null is obtained at the photomultiplier indicates that the length travelled by the light from the crystal to the reflector and back is an integral number of modulation wavelengths, possibly plus one half-wavelength. The quality of the null is adjustable by adjusting the orientation of the rhomb. Temperature correction may be provided by constructing a reference resonator defining the modulation wavelength of the same material as a structure being measured.
摘要翻译：为了测量距离，来自闪光管的光被偏振滤光器平面偏振，然后通过电光晶体进行偏振调制，然后沿着“摆动”光路通过，然后经受约四分之一波长的相对延迟然后在投射到远距离的目标反射体之前通过校准的可变光路。反射光沿着相同的路径返回，并且在通过偏振滤光器之后由光电倍增管检测。可变光路的调整直到在光电倍增管获得零点为止指示由从晶体到反射镜和背面的光行进的长度是整数个调制波长，可能加上一个半波长。通过调整菱形的方向可以调整零点的质量。温度校正可以通过构造定义与所测量的结构相同的材料的调制波长的参考谐振器来提供。

2. 发明授权

US4364271A Optical refractometer 失效
$Optical refractometer$
标题翻译：光折射仪
公开(公告)号：US4364271A
公开(公告)日：1982-12-21
申请号：US149558
申请日：1980-05-13
申请人： Keith D. Froome
发明人： Keith D. Froome
IPC分类号： G01L7/06 , G01L9/00 , G01L11/00 , G01N21/41 , G01W1/02 , G01N9/00
CPC分类号： G01L7/068 , G01L11/008 , G01L7/065 , G01L7/066 , G01L9/0036 , G01L9/0038 , G01L9/0039 , G01N21/41
摘要： A terrestrial refractometer comprising a gastight enclosure of substantially invariant transverse section and having a linearly movable endwall which varies in position in accordance with ambient temperature and pressure, the enclosure containing a fixed mass of a gas which at least approximates to an ideal gas; sensing means responsive to the linear position of the endwall; and compensating means arranged to apply a compensating factor which is proportional to the linear movement by the endwall from its position under conditions of standard temperature and pressure.
摘要翻译：一种陆面折射计，包括基本上不变的横截面的气密封壳，并具有根据环境温度和压力而在位置上变化的线性可移动端壁，所述外壳包含至少接近理想气体的固定质量的气体; 响应于所述端壁的线性位置的感测装置; 以及补偿装置，其布置成在标准温度和压力的条件下，通过端壁从其位置施加与线性运动成比例的补偿因子。

3. 发明授权

US4327585A Refractometer 失效
$Refractometer$
标题翻译：折射仪
公开(公告)号：US4327585A
公开(公告)日：1982-05-04
申请号：US149559
申请日：1980-05-13
申请人： Keith D. Froome
发明人： Keith D. Froome
IPC分类号： G01N21/41 , G01W1/06 , G01D21/02
CPC分类号： G01N21/41 , G01W1/06
摘要： A terrestrial refractometer comprises a gastight enclosure containing a fixed mass of a gas which at least approximates to an ideal gas, at least a part of the enclosure being movable in response to changes in the volume of the gas in accordance with changes in ambient temperature and pressure; constraining means for constraining said movable part so as to maintain the gas at a constant volume; and sensing means for providing a signal related to the force applied to the movable part by the constraining means.
摘要翻译：地面折射仪包括气体外壳，其包含至少接近理想气体的固定质量的气体，所述外壳的至少一部分可响应于环境温度的变化而气体的体积变化而是可移动的，并且压力; 约束装置，用于约束所述可移动部分，以便将气体保持在恒定的体积; 以及感测装置，用于提供与通过约束装置施加到可移动部分的力有关的信号。

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