Photomultiplier for a laser velocimeter
阅读：965发布：2023-05-15
专利汇可以提供Photomultiplier for a laser velocimeter专利检索，专利查询，专利分析的服务。并且A photomultiplier (PM) tube for a laser velocimeter in which electrodes are utilized in conjunction with a local oscillator signal to permit frequency heterodyning to extend the useful frequency response range of the photomultiplier tube. The heterodyne PM tube is then used as a component in a superheterodyne type signal conditioning instrument for a doppler shift laser velocimeter (LV).，下面是Photomultiplier for a laser velocimeter专利的具体信息内容。
1. A heterodyning photomultiplier tube apparatus in a laser velocimeter system comprising a photomultiplier tube including a glass wall for passage of an input laser signal therethrough, a photocathode receiving said input laser signal, said photocathode being positioned inside said photomultiplier tube, a dynode receiving electrons emitted from said photocathode, a control grid interposed between said photocathode and said first dynode, successive dynodes for electron multiplication, an anode positioned inside said photomultiplier tube, said anode collecting the electrons emitted from said dynode to provide an output signal, oscillator means external to said photomultiplier tube generating a preselected frequency to be fed to said control grid for injection into said photomultiplier tube for heterodyning with said input laser signal to provide a frequency difference signal as said output signal from said anode, said oscillator means being manually or voltage controlled, means to amplify the output signal from said photomultiplier tube, means to constant amplitude limit the amplified signal, frequency discriminator means receiving the limited signal, said frequency discriminator providing an output signal having a voltage level proportional to the deviation of the multiplier output signal frequency from the center frequency, a wideband gain amplifier operating as a frequency compression feedback circuit, a low pass gain amplifier operating as an average frequency tracking circuit, and means to selectively interconnect said oscillator means and said discriminator with said wideband amplifier or said low pass gain amplifier, said means to selectively interconnect also allowing said discriminator means to be disconnected to permit said oscillator to be manually tuned so that slow changes in the average frequency of the input signal are followed by manual tuning of said oscillator, said laser velocimeter system providing outputs to determine the average frequency of said input laser signal, the frequency deviation about the average, and the frequency deviation rate.
2. A heterodyning photomultiplier tube apparatus in a laser velocimeter system comprising a photomultiplier tube including a glass wall for passage of a laser signal therethrough, said glass wall having an exterior surface, a photo-cathode positioned inside said photomultiplier tube and receiving said laser signal passing through said glass wall and operating to emit electrons in response thereto, a first dynode receiving electrons from said photocathode and emitting further electrons therefrom, successive dynodes for electron multiplication, an anode collecting electrons emitted from said dynodes to provide an output signal, a control grid structure affixed to said exterior of said glass wall, said control grid structure receiving an input laser signal for passage through said glass wall, oscillator means generating a preselected frequency signal to be fed to said control grid, said oscillator means being external to said photomultiplier tube, said anode providing as said output signal a signal being the frequency difference between said input laser signal and said presElected frequency signal, said oscillator means being manually or voltage controlled, means to amplify the output signal from said photomultiplier tube, means to constant amplitude limit the amplified signal, frequency discriminator means receiving the limited signal, said frequency discriminator providing an output signal having a voltage level proportional to the deviation of the multiplier output signal frequency from the center frequency, a wideband gain amplifier operating as a frequency compression feedback circuit, a low pass gain amplifier operating as an average frequency tracking circuit, and means to selectively interconnect said oscillator means and said discriminator with said wideband amplifier or said low pass gain amplifier, said means to selectively interconnect also allowing said discriminator means to be disconnected to permit said oscillator to be manually tuned so that slow changes in the average frequency of the input signal are followed by manual tuning of said oscillator, said laser velocimeter system providing outputs to determine the average frequency of said input laser signal, the frequency deviation about the average, and the frequency deviation rate.
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