A Method for Measuring the Radius of a Spherical Reflector
A spherical mirror and measurement method technology, applied in the field of spherical mirror measurement, can solve problems such as large measurement errors, and achieve the effects of simple operation, low measurement cost, and easy realization
Active Publication Date: 2020-01-14
FLIGHT AUTOMATIC CONTROL RES INST
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Problems solved by technology
[0004] In order to solve the problem of relatively large measurement error of the radius of the spherical reflector used in the laser gyro in the prior art, the present invention provides a method for measuring the radius of the spherical reflector with simple operation, easy implementation and high measurement accuracy
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[0036] The present invention will be further described below by means of specific embodiments:
[0037] see figure 1 , which is a schematic diagram of the mode frequency spectrum of a ring resonator frame including a spherical mirror under test. It is characterized by including the longitudinal mode frequency interval F_M C 、 Frequency interval between TEM10s and TEM00s F10_00 C 、 Frequency interval F01_00 between TEM01s and TEM00s C , the spectrum of this mode contains information about the radius of the spherical mirror to be tested.
[0038] see figure 2 , which is a functional block diagram of the measurement system used in the method for measuring the radius of the spherical mirror of the present invention. Wherein, the measurement system includes a computer 1 , a detector and an amplifier 2 , a ring resonant cavity frame 3 , an optical path matching component 4 , a frequency-sweeping laser 5 , and a sawtooth wave generating circuit 6 connected in sequence. Wherein...
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The present invention belongs to a method for measuring radius of a spherical reflector, and especially relates to a method for measuring radius of a spherical reflector which forms a resonant cavity of a laser gyroscope. The method is characterized in that a frequency sweep laser outputs a laser of which frequency linearly changes, and then the laser is injected into an annular resonant cavity frame through an optical path matching component, wherein the resonant cavity frame consists of a cavity frame approaching an ideal shape, three planar mirrors, and a spherical reflector of which the radius is to be measured, a detector is utilized to receive a part of laser transmitted from the detected annular resonant cavity frame, the laser is processed through an amplifier and A / D conversion and is then acquired by a computer to obtain a mode frequency spectrum, finally, the obtained mode frequency spectrum is compared with a theoretic mode frequency spectrum of an annular laser resonator, so as to determine the radius of the spherical reflector. By changing measurement for the radius of the spherical reflector into comparison measurement between the corresponding annular resonant cavity mode frequency spectrum and the theoretic frequency spectrum, the method is simple in operation, easy to realize, low in measuring cost, and has a high practical application value.
Description
technical field [0001] The invention belongs to spherical mirror measurement technology, in particular to a method for measuring the radius of a spherical mirror. Background technique [0002] The radius is an important technical parameter of the spherical mirror, which directly affects the important performance of the optical system using it. It is generally required to be precisely measured during the manufacturing process of the mirror and the assembly and debugging process of the system. [0003] Usually the radius is calculated by using the interferometer or other means to obtain the chord-to-sagittal ratio of the spherical surface. However, the spherical mirror used for laser gyro has a small spherical cap area and high reflectivity, and the error of the aforementioned measurement method is relatively large. Contents of the invention [0004] In order to solve the problem of relatively large measurement error of the radius of the spherical reflector used in the lase...
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IPC IPC(8): G01B11/255
Inventor 张自国徐宏财王朋国李县洛王茜
Owner FLIGHT AUTOMATIC CONTROL RES INST