SU1511598A1 - Phase light finder - Google Patents

Abstract

The invention relates to a laser measurement technique, namely to ranging, and can be used for precision distance measurement and metrological certification of pulsed laser range finders. The purpose of the invention is to increase the range of the rangefinder. The range finder contains a system of lasers 1 located around a circle and equipped with stabilization systems 2, auto-tuning of carrier frequency and phase of envelope 3, the operation modes of lasers are synchronized by unit 4. The device has a radiation receiver 10, an amplifier 11, information processing system 12 and a recorder 13. Radiation lasers are matched with the optical system of the range finder using a cylindrical light guide 5. Light guide 5 simultaneously performs the functions of a matching element and an adder of radiation intensities grains. 2 Il.

Description

The invention relates to laser technology, more precisely to ranging and can be applied for precise measurement of large (km) and superlarge (L 102 c-m) distances, for example, to a satellite, the Moon, etc., as well as for metrological certification of pulsed laser range finders, will provide information about the distance traveled by the wave. This signal through the optical system 7 and the system of rotating mirrors (not shown) is fed to the input of the radiation receivers 10, which converts the optical signal into an electrical one. The electrical signal from the output of the receiver 10

assigned to work at these distances goes through amplifier 11 to the input

device 12 information signal processing and output device 12 to the input of the recorder 13.

When exciting the light guide oblique

neither

The purpose of the invention is to increase the range of the rangefinder.

Figure 1 shows the block diagram of the device; Fig. 2 is a diagram of the formation of 15 by the ray of the projection of its trajectory on along

luminous flux in the transmitter.

The device contains a source of laser radiation 1 from several lasers, the intensity of which is harmonically modulated, located along the circumferential generator and associated with power supply stabilization unit 2, carrier frequency and frequency control and envelope phase unit k, and laser synchronization unit k. Radiation of lasers by means of a cylindrical light. the wires 5 (matching element and intensity combiner) and the beam-splitting mirror 6 are connected via the optical system of the transmitter 7 with the reflector 8, as well as by the beam-splitting mirror 6 and the rotary mirror 9 connected to the input of the two-input radiation receiver 10, the output of which is connected to the amplifier input 11 connected via the information processing unit 12 to the input of the registration unit 13.

The device works as follows.

The harmonically modulated, stabilized and synchronized radiation of the lasers 1 is fed to the input of the light guide 5, which performs the coordination of this radiation with the optical system of the rangefinder 7 and the sum of the radiation intensities of all lasers, and by means of the beam-splitting element 6 is divided into two unequal streams, the smaller of which the pivoting mirror 9 is fed to the input of the radiation receiver 10 and serves as a reference signal when counting

phase shift on the measured path, then fully projected onto the annular

Yes, how much of the radiation flux goes to the optical system 7 and further to the measured path and the reflector 8. Phase of the reflected signal

the (useful) area of the main mirror, the Cassegeren telescope, ensuring the transmittance of the telescope is close to one.

the pepper section will have a caustic (figure 2), the radius Tg of which is given by

. Ji (Vl151pva.L

with - sine J J

0

0 5

five

where a e n.

a5

0

fiber radius; the angle of entry of the beam into the light guide; the refractive index of the core of the light guide; maximum angle of reflection

beam on the wall of the light guide.

I

A beam of such rays fills an annular region with a minimum radius r and a maximum radius a. Moreover, the radiation intensity over this region in a multimode fiber (s) is the same. An incoherent addition of electric fields is carried out in the light guide. By placing the output end of the light guide 5 into the focus of the secondary convex mirror of the Cassegeren telescope, aligning the light guide axis with the optical axis of the telescope 7 by selecting the radiation input angle of each of the lasers equal to arctg (rg / F), where r is the radius of the secondary convex mirror and the light guide diameter D is satisfied to the relation

D where

-)

 L is the laser wavelength;

F is the focal distance, matching of the laser radiation with the optical rangefinder system. In this case, the annular region of illumination of the output end of the light guide

fully projected onto the ring

the (useful) area of the main mirror, the Cassegeren telescope, ensuring the transmittance of the telescope is close to one.

5151

Formula of the invention. Phase spacing unit containing successively located laser source with a carrier frequency and frequency control loop and an envelope phase, a beam-splitting mirror transmitter optical system, reflector, receiver optical system, two-input radiation receiver, amplifier, information processing unit and recording unit, the second the input of the two-input radiation receiver is optically coupled to the beam-splitting

15986

mirror through a rotary mirror, characterized in that, in order to increase the measuring range of the scientific research institute, it is provided with a cylindrical light guide, located in front of the beam-splitting mirror, and power supply stabilization and synchronization units associated with

10 with the corresponding inputs of a laser radiation source made in the form of several lasers equidistant from the cylindrical light guide and located symmetrically to its axis.

V

Claims (1)

Claim Phase phototachymeters comprising in sequence the laser source to the block automatic frequency carrier-envelope phase-splitting mirror _L optical transmitter system, a reflector, an optical receiver system, two-input radiation detector, amplifier, data processing unit and recording unit, wherein the second input mirror through a rotational mirror, characterized in that, in order to increase the measurement range, it is equipped with a cylindrical optical fiber located in front of the beam splitter mirror, and the blocks stabilize the supply voltage and synchronize operating modes associated with the corresponding inputs of the laser radiation source, made in the form of several lasers, is equidistant