Birefringence type measuring device
First Claim
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1. A measuring device utilizing birefringence effect comprising:
- means for producing laser light having two components of a first frequency and a second frequency, which are polarized in directions perpendicular to each other;
birefringence means comprising an electro-optical device provided to receive said laser light and to deliver an output laser light having first and second components, said components having a phase difference varied in accordance with an electric field to be measured;
an optical analyzer provided to receive the optical output of said birefringence means and to extract a component polarized in a predetermined direction;
a photoelectric converter for converting said extracted component of said light output into an electric signal having a frequency corresponding to a difference between said first and second frequencies and being phase modulated by said phase difference varied in accordance with the electric field to be measured;
means for extracting one portion of said laser light delivered from said laser light producing means, and for converting said one portion of laser light into a reference electric signal; and
processing means for comparing said phase-modulated electric signal delivered from said photoelectric converter with said reference electric signal so as to produce an output representing said phase difference corresponding to the electric field.
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Abstract
In a measuring device utilizing birefringence effect, there are provided a device for producing laser light having two components polarized in directions perpendicular to each other and respectively having first and second frequencies; and a birefringence device which receives the laser light and delivers an optical output having a phase difference between the two components which is varied in accordance with the measured quantity. A specific component of the optical output is extracted by an optical analyzer, and converted into an electric signal which is processed thereafter into an output signal representing the phase difference and hence the measured quantity.
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7 Claims
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1. A measuring device utilizing birefringence effect comprising:
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means for producing laser light having two components of a first frequency and a second frequency, which are polarized in directions perpendicular to each other; birefringence means comprising an electro-optical device provided to receive said laser light and to deliver an output laser light having first and second components, said components having a phase difference varied in accordance with an electric field to be measured; an optical analyzer provided to receive the optical output of said birefringence means and to extract a component polarized in a predetermined direction; a photoelectric converter for converting said extracted component of said light output into an electric signal having a frequency corresponding to a difference between said first and second frequencies and being phase modulated by said phase difference varied in accordance with the electric field to be measured; means for extracting one portion of said laser light delivered from said laser light producing means, and for converting said one portion of laser light into a reference electric signal; and processing means for comparing said phase-modulated electric signal delivered from said photoelectric converter with said reference electric signal so as to produce an output representing said phase difference corresponding to the electric field. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification