CN104166233A - Multi-reflecting-surface rotating optical delay line device based on involute principle - Google Patents

Abstract

The invention discloses a multi-reflecting-surface rotating optical delay line device based on the involute principle. The multi-reflecting-surface rotating optical delay line device comprises a rotating turnplate, a plurality of planar reflecting mirrors, involute curve reflecting surfaces, an involute curved surface base circle, a support and a base. The rotating turnplate is fixed to the support, and the support is fixed to the base; the center position of the involute curved surface base circle of each involute curve reflecting surface coincides with the center position of the rotating turnplate; the rotating turnplate is driven by a motor to rotate, the planar reflecting mirrors are evenly arranged on the periphery of the rotating turnplate, and the straight line where the planar reflecting mirrors are located penetrates through the central axis of the rotating turnplate; the involute curve reflecting surfaces are fixedly arranged on one side of the rotating turnplate, and the inner curved surfaces of the involute curve reflecting surfaces are arranged to face the rotating turnplate and serve as reflecting surfaces. The multi-reflecting-surface rotating optical delay line device can obtain optical delay lines at high speed in the wide range with good linearity and small light energy loss.

Description

Multiple reflection face rotary optical delay line device based on principle of forming involute

Technical field

The present invention relates to Fibre Optical Sensor and field of optical detection, particularly relate to a kind of optical delay line device.

Background technology

At present, in field of optical detection, the optical delay line field that has a wide range of applications, as: terahertz time-domain spectroscopic technology, Superfast time resolution rate spectral technique, Optical Coherence Tomography Imaging Technology and optical pumping-Detection Techniques etc.

Conventional optical delay line be the optical back controlled of linear micro-displacement platform to catoptron, it is large that this class optical delay line has delayed sweep scope, installs the advantages such as simple, but due to motor-driven machinery inertial, cannot realize rapid scanning.Someone proposes to change with Piezoelectric Ceramic catoptron the change in optical path length amount of light beam, and principle is to utilize the inverse piezoelectric effect of piezoelectric ceramics, can make it under additional driving voltage condition, extend and contraction, and it periodically extends more than contraction frequency can reach kHz.Although the displacement that piezoelectric ceramics can be realized at a high speed changes, its displacement change amount is small, the expose thoroughly requirement of scope of the system that cannot reach.Also someone proposes to use revolving cube, uses motor to drive, and has greatly accelerated sweep velocity, but has been subject to the restriction of its surface configuration, scan inhomogeneous, poor linearity, in rotary course, sweep limit is uncertain simultaneously.

By above analysis, how to design that a kind of sweep limit is large, sweep velocity is high, linearity is good, optical delay line that optical energy loss is little becomes vital problem.

Summary of the invention

In order to overcome the deficiencies such as the optical delay line sweep velocity of present use is slow or sweep limit is little, the present invention proposes a kind of multiple reflection face rotary optical delay line device based on principle of forming involute, utilize the periodic scan of the reflecting surface of a plurality of rotations, obtain optical delay line.

The technical solution used in the present invention is:

A kind of multiple reflection face rotary optical delay line device based on principle of forming involute, it is characterized in that, this device comprises rotary turnplate 1, a plurality of plane mirror 2, involute curve reflecting surface 3, involute surface basic circle 4, support 5 and base 6, rotary turnplate 1 is fixed on support 5, and support 5 is fixed on base 6; The center of the involute surface basic circle 4 of described involute curve reflecting surface 3 and the center of rotary turnplate 1 coincide; Rotary turnplate 1 is rotated by driven by motor, and a plurality of plane mirrors 2 evenly arrange along the excircle of rotary turnplate 1, the central axis of plane mirror 2 place straight line over-rotation rotating disks 1; Rotary turnplate 1 one sides are fixedly installed involute curve reflecting surface 3; The negative camber of described involute curve reflecting surface 3 is in the face of rotary turnplate 1 arranges, as reflecting surface.

Compared with prior art, advantage of the present invention and beneficial effect are: adopt the evenly fixing a plurality of plane mirror structures of rotary turnplate and surrounding, each plane mirror changes once the light path of light beam.The structure of a plurality of plane mirrors, when rotary turnplate rotates a circle, makes the variation of light beam light path generating period, compares linear displacement platform, has greatly improved measurement efficiency, and measuring speed is reached fast even at a high speed;

Light is in transmitting procedure, and plane mirror only makes light beam impinge perpendicularly on involute surface along the tangential direction of involute surface basic circle, and vertical reflection, makes light return according to incident direction simultaneously; Light incides the negative camber of involute surface, and negative camber converges effect for light beam, the disperse function of the positive camber involute urve structure of comparing other to light beam, and it is a lot of that negative camber reduces the optical energy loss of light beam on involute surface;

The involute curve principle of this optical delay line application is clear, and in deferred mount, design of part used is simple, is easy to processing, and this application of installation is in extensive range, and reliable operation, function admirable;

When rotary turnplate is rotated, incident ray is in adjacent next planar mirror surface reflection, and rotary turnplate is rotated one week, makes anti-raw periodic variation of incident beam light path, greatly improves measuring speed.

Accompanying drawing explanation

Fig. 1 is the one-piece construction figure of optical delay line device of the present invention;

Fig. 2 is the light transmition schematic diagram of optical delay line device of the present invention;

Fig. 3 is principle of forming involute figure.

Reference numeral:

1, rotary turnplate; 2, plane mirror; 3, involute surface; 4, involute surface basic circle; 5, support; 6, base.

Embodiment

Below in conjunction with the drawings and the specific embodiments, be described in further detail technical scheme of the present invention.

As shown in Figure 1, the one-piece construction of optical delay line device of the present invention comprises rotary turnplate 1, plane mirror 2, involute surface 3, involute surface basic circle 4, support 5 and base 6.Motor drives rotary turnplate 1 to rotate, simultaneously, along the evenly also rotation simultaneously of a plurality of plane reflection faces 2 (reflecting surface place straight line is crossed the basic circle center of circle) of setting of excircle of rotary turnplate 1, and the angle between each plane mirror is equal, makes the repeatedly variation of the light path generating period of incident light; The reflecting surface of plane mirror 2, the reflection angle of change glancing incidence light, light incides the difference on involute surface 3 (involute surface basic circle 4 centers and rotary turnplate 1 center superposition) along the tangential direction of involute surface basic circle 4.Involute surface reflecting surface is the negative camber of involute surface 3, and the light beam of incident is played to converging action.The periodic scan that rotates to form device of plane mirror 2.

As shown in Figure 2, the optical propagation principle of the optical delay line device of invention is: light along continuous straight runs incides plane mirror fixing in rotary turnplate 12, in rotary turnplate rotation process, while making plane mirror and vertical direction have certain drift angle, incident ray reflects, reflected light along the tangential direction of involute surface basic circle 4 impinge perpendicularly on involute surface 3 certain a bit, again along incident path, return to vertical reflection light, when rotary turnplate 1 is to next angle, incident ray can impinge perpendicularly on along basic circle tangential direction another point of involute surface reflecting surface.Because twice incidence point on involute surface reflecting surface is different, twice incident ray point of contact tangent from involute urve basic circle is different, circular arc arc length difference, and light light path in transmitting procedure changes.When rotary turnplate is rotated, incident ray is in adjacent next planar mirror surface reflection, and rotary turnplate is rotated one week, makes anti-raw periodic variation of incident beam light path, greatly improves measuring speed.

As shown in Figure 3, the curvilinear equation formula of involute curve reflecting surface is:

$\left\{\begin{array}{c}x=r\cos \mathrm{\θ}+\mathrm{r\θ}\sin \mathrm{\θ}\\ y=r\sin \mathrm{\θ}-\mathrm{r\θ}\cos \mathrm{\θ}\end{array}\right.$

Involute urve has following two characteristics: 1, the normal of any point on involute urve, and tangent with the basic circle of involute urve; 2, the point of contact of normal and basic circle, to the distance of this point on involute urve, equals point of contact to the arc length of involute urve and the initial intersection point of basic circle.

According to above principle, when the tangential direction of light along involute surface basic circle 4 incides on involute surface 3, different incidence points is different to the distance between point of contact, and the variable quantity of light light path is different, and its size can be calculated by the arc length on basic circle, that is:

For those skilled in the art, some improvements and modifications of making under the prerequisite that does not depart from this patent principle, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (1)

1. the multiple reflection face rotary optical delay line device based on principle of forming involute, it is characterized in that, this device comprises rotary turnplate (1), a plurality of plane mirror (2), involute curve reflecting surface (3), involute surface basic circle (4), support (5) and base (6), it is upper that rotary turnplate (1) is fixed on support (5), and support (5) is fixed on base (6); The center of the involute surface basic circle (4) of described involute curve reflecting surface (3) and the center of rotary turnplate (1) coincide; Rotary turnplate (1) is rotated by driven by motor, and a plurality of plane mirrors (2) evenly arrange along the excircle of rotary turnplate (1), the central axis of plane mirror (2) place straight line over-rotation rotating disk (1); Rotary turnplate (1) one side is fixedly installed involute curve reflecting surface (3); The negative camber of described involute curve reflecting surface (3) is in the face of rotary turnplate (1) arranges, as reflecting surface.