CN103308229B - Laser optical electric axis power measuring probe - Google Patents

Abstract

The invention relates to a laser photoelectric axis power measuring probe, which is mainly composed of a measuring probe optical chamber (1), a fiber optic focusing mirror (9), a photodiode (10) and a laser diode (12). The measuring probe optical chamber ( 1) There is a fixing groove, which accommodates and fixes the fiber optic focusing lens (9), photodiode (10), and laser diode (12), wherein the fiber optic focusing lens (9) and the laser diode (12) are connected through optical fibers. The invention has the advantages of integrated measurement probe structure, saving installation space, convenient installation of optical fiber with embedded structure, the invention adopts optical fiber focusing mirror to gather laser light to improve measurement accuracy, and the invention is integrally sealed, waterproof and dustproof without being affected by the working environment.

Description

Laser Photoelectric Shaft Power Measurement Probe

technical field

The invention relates to a part of a measuring device, in particular to a laser photoelectric shaft power measurement probe suitable for photoelectric non-contact shaft power measurement, which is suitable for applications such as monitoring the working condition of a shaft system.

Background technique

In ship navigation, the propulsion shafting is an important part to realize the energy transfer between the ship's main engine and the propeller (generally the propeller), and it is an indispensable and important part of the ship's power plant system. With the development of ships in the direction of large-scale, high-speed and automation, higher requirements are put forward for the safety and reliability of propulsion shafting. By monitoring the operating status of the ship's power system online in real time, and judging whether there is a fault and the severity of the fault, the reliability of the ship's power system can be improved. At the same time, through the online monitoring of the shaft power and the wear state of the diesel engine, the interactive relationship between the two can be obtained, so as to achieve the goal of energy saving and consumption reduction through the optimal control of the output power of the diesel engine. Therefore, it is of great significance to carry out research on shaft power monitoring technology.

The power of the output shaft is one of the most important performance parameters of a diesel engine, and the shaft power is generally measured by measuring the torque and rotational speed. The operating conditions of ships are very complex, and the matching of ship-engine-propeller has an important impact on the safe and efficient operation of ships. When the diesel engine does not match the propeller, on the one hand, the power of the diesel engine may not be fully utilized to achieve the designed speed and drag; on the other hand, it may cause serious overload of the diesel engine and shorten the service life of the main engine. In addition to the good performance of the diesel engine itself, the design of modern ships must also ensure the best match between ship-engine-propeller. By measuring the shaft power of the ship's power system online, not only can it be found whether the technical condition of the diesel engine is good, but also the matching of the ship-engine-propeller can be judged

Various shaft power measurement methods generally calculate the shaft power by measuring the shafting torque. The basic principles of shafting torque measurement are divided into balance force method, energy conversion method and transfer method. The balance force method is a method of using the balance torque to balance the measured torque to obtain the torque; the energy conversion method is a method of measuring the torque according to the law of energy conservation, and the measured torque is determined by measuring other energy coefficients related to the torque The size; the transfer method is a method of measuring the torque according to the change of the physical parameter (deformation, stress or strain) produced by the elastic element when the torque is transmitted. The balance force method is only suitable for uniform speed and static conditions; the energy conversion method has too many indirect measurement factors, and the error is large. Both methods are not suitable for dynamic measurements.

Ship shaft power monitoring devices are mainly divided into contact type and non-contact type according to the measurement method. Contact measuring device technology has matured and is widely used in shaft power and torque measurement. Most contact measuring devices are based on the principle of strain, that is, using strain gauges to convert the shear stress of the shafting section into electrical signals, which are amplified and then received and measured by the measuring instrument. Although the current relatively advanced shaft power monitoring device uses a telemetry strain gauge, the measurement effect is still unsatisfactory. In addition, the installation and maintenance of the strain gauge is difficult and it is easily affected by complex environmental factors. The performance is not stable enough, and the measurement results are not satisfactory. Accurate, requires regular calibration. Non-contact measurement is the future development direction of shafting power and torsion measurement. At present, there are mainly magnetoelastic measurement method and laser Doppler measurement method. The former is measured according to the magnetoelastic effect, but its effect depends to a large extent It depends on the material properties and processing technology of the shaft; the latter is measured based on laser Doppler technology and optical heterodyne principle, but the error caused by the temperature drift of the photoelectric measurement sensor cannot be avoided.

The method of non-contact shaft power measurement is to install two photoelectric code discs on the shaft system. When a certain torque is transmitted on the shaft, the two code discs will appear relative torsion during the rotation process. By detecting the relative torsion angle The size of the torque transmitted on the current shaft can be calculated. The monitoring of the torsion angle of the two code discs depends on the photoelectric sensor shown in the figure, and the accuracy of angle monitoring depends on the diameter of the beam output by the sensor and the response speed of the photoelectric sensor. The smaller the beam diameter, the faster the response speed of the photoelectric sensor. The higher the value, the more accurately the edge of the photoelectric code disc can be detected, so that the change of the relative torsion angle between the two code discs can be accurately obtained, and then the power and torque of the shaft can be calculated according to the torsion angle.

Contents of the invention

The technical problem to be solved by the present invention is to provide a laser photoelectric shaft power measurement probe conducted through an optical fiber to improve the practicability and applicability of the photoelectric non-contact shaft power measurement system. The measurement probe re-optimizes the measurement system probe The structure enables the measurement system to adapt to various working conditions.

The technical solution adopted by the present invention to solve the technical problem is: mainly composed of a measuring probe optical chamber, a fiber optic focusing mirror, a photodiode and a laser diode, the measuring probe optical chamber is provided with a fixing groove, and the fixing groove accommodates and fixes the fiber optic focusing mirror , a photodiode, a laser diode, wherein the fiber focusing mirror and the laser diode are connected through an optical fiber.

The optical chamber of the measuring probe is provided with three fixing grooves, and these fixing grooves can accommodate and fix the fiber focusing mirror, photodiode and laser diode respectively.

The bottom of the optical chamber of the measuring probe can be fixedly connected with the installation base; the left side can be provided with an aviation plug interface; The fiber chamber, the second fixing groove, the longitudinal U-shaped notch and the third fixing groove; the second fixing groove and the third fixing groove are respectively located at the left and right ends of the longitudinal U-shaped notch; the laser focus fixed on the second fixing groove The mirror and the photodiode fixed in the third fixing groove form a direct relationship; after the laser diode is energized, the optical fiber transmits the laser light to the fiber focusing mirror, and the divergent laser light converges in the middle of the U-shaped slot and then diverges to form a spot to irradiate the photoelectric photosensitive side of the diode.

The outside of the concave area is provided with a cover plate to prevent the intrusion of dust and liquid and to protect the optical elements. The cover plate can be contacted and pressed with the upper surface of the optical chamber of the measuring probe with screws, and the contact surface is sealed with a sealant. Waterproof and dustproof.

The laser diode can be wrapped in a heat-shrinkable tube and then connected to the first fixing groove, and the whole is clamped in the first fixing groove, and then fixed with optical glue.

The fiber focusing lens is connected to the second fixing groove through optical glue, and the fiber focusing lens is installed at the light emitting end of the optical fiber.

The photodiode can be connected to the third fixing groove through optical glue, and the photodiode is pressed tightly after the cover plate tightly covers the optical element installation chamber of the optical chamber of the measuring probe.

The optical fiber adopts an embedded structure and is located in the optical fiber chamber.

The power supply and signal output of the laser photoelectric shaft power measurement probe can be directly connected to the control board installed next to the monitored shaft through an aviation plug to realize communication.

Compared with the prior art, the present invention has the following main advantages:

1. The light source and detector are integrated into an integral structure, which saves a lot of space. Compact structure and easy installation. However, the space between the light source and the detector is relatively wide, which reduces the requirements for the installation accuracy of the on-axis photoelectric code disc.

2. Because the external optical fiber is replaced by the cable, the cost is saved. In addition, the optical fiber has higher requirements on the external environment. The optical fiber of the present invention is embedded inside, so the installation of the optical fiber is also convenient, and the stability of the photoelectric probe is improved. The power supply and signal output of the probe are directly connected to the control board through the aviation plug to realize communication.

3. The use of fiber optic focusing mirrors to focus the laser reduces energy loss and reduces the laser spot size at the focal point to within 0.5mm, reducing measurement errors caused by excessively large focused spot sizes and improving measurement accuracy.

4. The measuring probe adopts an airtight structure as a whole, which is waterproof and dustproof, so the requirements for the working environment are not high, and it can be applied to harsh measurement environments.

5. Laser diodes have the advantages of high response speed (ns (nanosecond) level response time), small size and long life. The components used in the probe can be purchased in the market, so the operation and maintenance in the later stage are convenient and simple, and the maintainability of the measurement system is improved.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the optical chamber of the laser photoelectric axial power measurement probe of the present invention.

Fig. 2 is a schematic diagram of the overall shape and structure of the laser photoelectric axial power measuring probe of the present invention.

Fig. 3 is a schematic diagram of the optical structure of the laser photoelectric axial power measuring probe of the present invention.

Fig. 4 is a schematic diagram of a code disc installed on the shafting for measuring the torsion angle.

In the figure: 1. Measuring probe optical chamber; 2. Aviation plug interface; 3. First fixing slot; 4. Optical fiber chamber; 5. Second fixing slot; 6. Third fixing slot; 7. Installation base; 8. Cover plate; 9. Fiber focusing mirror; 10. Photodiode; 11. Optical fiber; 12. Laser diode; 13. Signal input end; 14. Signal output end.

Detailed ways

The laser photoelectric axial power measurement probe of the present invention adopts the structure of optical fiber + laser diode + optical fiber focusing mirror + photoelectric detector, and integrates all components into the inside of the sensor probe, no longer needs to use optical fiber outside the probe, and only uses a short The distance is fixed to the optical fiber, and the external cable is connected to the power supply and the electrical signal to the controller through a waterproof aviation plug. The entire probe shell is designed to be waterproof and dustproof to meet the use requirements in harsh environments.

The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the content of the present invention is not limited.

The laser photoelectric shaft power measuring probe applied to the non-contact photoelectric shaft power measuring device provided by the present invention has a structure as shown in Fig. Composed of diodes 12, wherein: the measuring probe optical chamber 1 is provided with three fixing grooves, these fixing grooves accommodate and fix the fiber focusing mirror 9, photodiode 10, laser diode 12 respectively, the fiber focusing mirror 9 and the laser diode 12 are connected through the optical fiber 11.

The optical chamber 1 of the measuring probe is fixedly connected to the installation base 7 at the bottom; the aviation plug interface 2 is provided on the left side; A fixing groove 3, an optical fiber chamber 4, a second fixing groove 5, a longitudinal U-shaped notch and a third fixing groove 6; the second fixing groove 5 and the third fixing groove 6 are respectively located at the left and right ends of the longitudinal U-shaped notch . The outside of the concave area is sealed by a cover plate 8 to prevent dust and liquid from intruding and to protect the optical elements. The cover plate 8 is connected with the measuring probe optical chamber 1 by screws, and the contact surface is sealed with a sealant to achieve the waterproof and dustproof purpose of the measuring probe.

The optical fiber 11 adopts an embedded structure, which is convenient for installation, and is located in the optical fiber chamber 4 .

The laser diode 12 is wrapped in a heat-shrinkable tube and connected to the first fixing slot 3 , and is clamped in the first fixing slot 3 as a whole.

The fiber focusing lens 9 is connected to the second fixing groove 5 through optical glue, and the fiber focusing lens 9 is installed on the light emitting end of the optical fiber 11 .

The photodiode 10 is connected to the third fixing groove 6 through optical glue, and the photodiode 10 is pressed tightly after the cover plate 8 is tightly covered on the optical chamber 1 of the measuring probe.

The photodiode 10 adopts an adjustable focus laser diode with a working voltage of 5V, a power of 5mW, and a wavelength of 650nm. The shape is cylindrical, the size is 6mm in diameter, and the length is 10mm; Type fiber optic tube; the fiber optic focusing lens adopts FFLM-06-03 focusing lens, its detection distance is 17mm, the diameter of the light spot at the focal point after focusing is 0.5mm, and the detection distance can be increased by 8 times when it is attached to the supporting fiber optic tube. Its shape is A cylinder with a diameter of 10.6mm and a length of 26mm; the photodiode adopts the GT101 photodetector of the 44th Research Institute of China Electronics Technology Group, the diameter of the photosensitive surface is 0.5mm, and its spectral response range is 400-1100nm. The voltage is 0-15V, and its size is 5mm in diameter and 5mm in length; the aviation plug adopts Weipu IP13-4 core waterproof aviation plug, which has an O-shaped sealing ring, which can effectively prevent water infiltration, and it has 4 signal Among the transmission terminals and the cables drawn from the aviation plug, two are connected to the laser diode to provide power, and the other two are connected to the photodiode to transmit the electrical signal output by the photodiode to the acquisition card. The aviation plug can integrate signal input and output, simplifying the connection between the probe and the control circuit board.

The length of the optical fiber and cable is determined according to the actual situation. The optical fiber is installed in the optical chamber of the measuring probe. The two ends of the optical fiber are respectively connected to the laser diode and the optical fiber focusing mirror. Near the rotating shaft, the cable length shall not exceed 5m.

The above-mentioned laser photoelectric shaft power measurement probe provided by the present invention, the transmission process of the electrical signal and the optical signal in the probe is: first, the controller inputs the power supply voltage to the probe through the aviation plug interface 2, and the aviation plug interface 2 communicates with the laser respectively through the electric wire The laser diode in the diode chamber 3 is connected to the photodiode in the photodiode fixing groove 6 . The laser diode in the laser diode chamber 3 converts the received electrical signal into an optical signal, and transmits it to the fiber focusing mirror fixed in the fiber focusing mirror fixing groove 5 through the optical fiber in the fiber optic chamber 4 inside the probe. The photodiode in the photodiode fixing groove 6 receives and converts the optical signal into an electrical signal, and outputs it to the main control circuit board through the cable in the aviation plug.

The above-mentioned laser photoelectric shaft power measurement probe provided by the present invention is directly connected with the control board installed beside the monitored shaft through the aviation plug for power supply and signal output, so as to realize communication. The working process of the probe is as follows: Referring to Figure 3, after the laser diode 12 is energized and lit, the laser light is transmitted to the fiber focusing mirror 9 through the optical fiber 11, and the laser beam focused by the fiber focusing mirror 9 converges at the focal point and then diverges to irradiate the photodiode 10 A current output is generated on the photosensitive surface, and the output current signal is transferred to the detection circuit board by the cable 14 and converted into a high-level voltage signal. When the shaft power monitoring system is working, when the photoelectric code disc installed on the shaft rotates with the shaft, it sweeps the focus of the laser beam in the U-shaped groove of the photoelectric measuring probe, and the light-shielding teeth on the code disc will block the laser beam. A low-level output is formed at 10. When the code disc continuously sweeps the photoelectric measuring probe, the photodiode will output a level pulse signal. The level pulse signal output by two photodetectors can detect the torque change of the shafting.

The above-mentioned laser photoelectric axial power measuring probe provided by the present invention has a manufacturing method as follows:

In the production of the probe shell, the processing method of three-dimensional milling is adopted. According to the size of each part in the three-dimensional structure diagram, grooves of appropriate depth and size are dug on the metal shell. Pay attention to the center between the grooves with different depths. Lines are aligned, and in order to facilitate processing, the corners of the grooves are processed into rounded corners with a radius of 3mm.

The detailed assembly method of the measurement probe is as follows: firstly, the laser diode is wrapped and fixed in the laser diode chamber with a hose, and then the power input end of the aviation plug is connected to the laser diode with a cable. Then, use the same method as the laser diode fixing method to fix the fiber focusing lens, the fiber focusing lens and the optical fiber are connected through the fiber tube, and the optical fiber is fixed by multi-point bonding to connect the optical fiber to the laser diode; The photodiode is fixed and connected to the output terminal of the aviation plug through a wire, and finally the cover is covered, and after being fastened in place by screws, the bottom plate is fixed by connecting the photoelectric measuring probe with the bottom plate screws.

The cover plate of the photoelectric measuring probe is connected to the bottom plate through 8 M3 screws with a depth of 10mm, and the fixed base plate of the photoelectric measuring probe is connected with the cover plate of the photoelectric measuring probe and the bottom plate of the photoelectric measuring probe through 4 M5 sinking screws with a depth of 15mm . In order to prevent water splashing inside the cabin, in addition to using waterproof aviation plugs, use waterproof glue to fill the gap between the photoelectric measuring probe fixed bottom plate, photoelectric measuring probe bottom plate, and photoelectric measuring probe cover to prevent water from infiltrating , affecting the normal operation of the probe. During the working process of the probe, in order to prevent the signal error caused by the movement of the probe relative to the code disc, the four M8 bolts at the four corners of the bottom plate fixed by the photoelectric measuring probe can be used to fix the probe with two semicircular fixing grooves with a width of 8mm.

During the assembly process, pay attention to aligning the optical fiber with the center of the laser diode to facilitate optical signal transmission; align the fiber focusing mirror with the centerline of the photodiode to facilitate the photodiode to receive the laser signal; redundant optical fibers can be stored around in the optical fiber chamber. During use, the laser probe can be fixed through the screw holes and waist holes on the bottom plate.

The concrete application process of measuring probe of the present invention is as follows:

The laser photoelectric shaft power measurement probe proposed by the present invention is generally used in photoelectric non-contact shaft power measurement devices, that is, through the method of measuring the torsion angle of the shaft system, two photoelectric encoder discs are installed at an appropriate distance on the measured rotating shaft, as shown in the figure 4. During the rotation of the measured rotating shaft, the two photoelectric code discs sweep across the photoelectric measuring probe respectively, and a bright/dark light pulse signal is formed when the probe light passes through and is blocked by the code disc. When a load is added to the rotating shaft to be tested, the rotating shaft will intensify its torsion, and a small relative torsion will occur between the two gear discs. By comparing the phase difference of the pulse signals output by the two photoelectric measuring probes, the torsion angle of the measured rotating shaft can be calculated. The larger the angle, the greater the torque currently transmitted by the shafting. When this angle is calculated, combined with physical parameters such as the elastic modulus of the measured shaft material, the torque value of the shaft system after loading can be calculated, and finally the shaft power can be calculated based on the rotational speed. Calculated as follows:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; T\&omega;</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; T</span>}\frac{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 60</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; T</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;n</span>}}{\mathrm{<span\; class="notranslate">\; 30</span>}}$

In the formula: P—shaft power (kw); T—output torque of the shaft system (N m); n—output shaft speed (r/min).

When the rotating bearing is loaded, a torque T is generated, the shaft is deformed, and a relative torsion angle θ (rad) will be generated on any two cross-sections with a distance of L. The calculation formula is as follows:

$\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 180</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\frac{\mathrm{<span\; class="notranslate">\; G</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}\mathrm{<span\; class="notranslate">\; \&theta;</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}$

Among them: T—the output torque of the shaft system (N m); L—the distance between the two photoelectric code discs (m); I _p —the moment of inertia of the shaft (m ⁴ ); G—the shear elastic modulus of the material Volume (Pa)

When the shaft is a solid shaft, $I_p=\frac{\mathrm{\&pi;}}{2}\&CenterDot;R^4,$

When the shaft is hollow, $I_p=\frac{\mathrm{\&pi;}}{2}\&CenterDot;(R^4-r^4)$

In the formula: R—the outer radius of the shaft (m); r—the inner radius of the shaft (m).

In the design, the dark pulse is used as the measurement basis, that is, the low-level pulse output by the photoelectric switch. The two light-shielding sheets and the second light-shielding sheet are respectively swept across the photoelectric switch to generate two low-level pulse outputs. According to the change of the phase difference between the two low-level pulses, the torsion angle during the working process of the shafting can be measured, so as to calculate the torque transmitted on the shafting, and finally calculate the shafting speed combined with the shafting speed. The size of the upper power.

The optical signal generated by the laser diode is transmitted through the optical fiber. Since the output of the optical fiber has a certain divergence of the laser beam, it is necessary to use a fiber optic focusing mirror to converge the divergent laser signal. The laser signal diverges again after passing through the focal point, and the divergent spot is irradiated on the photodiode. The circuit pulse signal is analyzed and judged. Such a design can not only converge the laser signal to a very small spot (less than 0.5mm), so as to improve the measurement accuracy when the photoelectric code disc sweeps through the focus.

The above photoelectric non-contact shaft power measuring device probe provided by the present invention is used to measure the torsion angle of the measured rotating shaft by using photoelectric technology, and the measurement basis is all logical quantities. Specifically: during the rotation of the measured rotating shaft, at least two measuring probes are used to detect the square wave signal output when the same number of photoelectric code discs sweep across the corresponding measuring probes, and the phase difference between the two square waves is detected. Measure the angle signal of the torsional deformation of the rotating shaft under test. After the angle signal is logically calculated and processed in the controller, the computer calculates the torque and power of the rotating shaft under test.

The measuring probe is fixed beside the rotating shaft during the measurement process, does not come into direct or indirect contact with the shaft, and does not affect the normal operation of the shaft.

Multiple measuring probes can be installed beside the same rotating shaft to be measured, and the number of probes is equal to the number of code discs, corresponding one to one, so as to meet the torque variation of multi-segment shafts.

All the components described in the above embodiments can be purchased in the market. It is convenient for later maintenance and replacement parts.

Claims (8)

1. a laser photoelectricity shaft power measurements probe, it is characterized in that forming primarily of measuring sonde optical chamber (1), optical fiber focus lamp (9), photodiode (10) and laser diode (12), wherein: described measuring sonde optical chamber (1), be fixedly linked with mounting seat (7) bottom it; Aviation plug interface (2) is provided with on the left of it; Be indent district in the middle part of it, this indent district is provided with the left and right end that the first pickup groove (3), optical fiber chamber (4), the second pickup groove (5), longitudinal U-lag mouth and the 3rd pickup groove (6) second pickup groove (5) and the 3rd pickup groove (6) lay respectively at longitudinal U-lag mouth from left to right successively; Three described pickup grooves hold and fixed fiber focus lamp (9), photodiode (10), laser diode (12) respectively, and wherein optical fiber focus lamp (9) is connected by optical fiber with laser diode (12).

2. laser photoelectricity shaft power measurements probe according to claim 1, is characterized in that; The laser condensing lens being fixed on the second pickup groove and the photodiode being fixed on the 3rd pickup groove form correlation relation; After laser diode (12) energising, optical fiber is by laser conduction to optical fiber focus lamp (9), and the laser dispersed is dispersed formation hot spot again and is irradiated on the photosurface of photodiode (10) after described U-type groove mouth converges.

3. laser photoelectricity shaft power measurements probe according to claim 2; it is characterized in that the outside in described indent district is provided with to prevent dust and liquid from invading and protecting the cover plate (8) of optical element; this cover plate screw contacts with the upper surface of measuring sonde optical chamber (1) and compresses, and surface of contact realizes water proof and dust proof with sealant sealing.

4. laser photoelectricity shaft power measurements probe according to claim 2, it is characterized in that described laser diode (12) is by being connected with the first pickup groove (3) after heat-shrink tube parcel, entire card is contained in the first pickup groove (3), then fixes with optics clay.

5. laser photoelectricity shaft power measurements probe according to claim 2, it is characterized in that described optical fiber focus lamp (9) is connected with the second pickup groove (5) by optics clay, optical fiber focus lamp (9) is arranged on the beam projecting end of optical fiber (11).

6. laser photoelectricity shaft power measurements probe according to claim 2, it is characterized in that described photodiode (10) is connected with the 3rd pickup groove (6) by optics clay, cover tightly after the optical element of measuring sonde optical chamber (1) installs chamber at cover plate (8), photodiode (10) is compacted.

7. laser photoelectricity shaft power measurements probe according to claim 1, is characterized in that described optical fiber (11) adopts insert structure, is arranged in optical fiber chamber (4).

8. laser photoelectricity shaft power measurements probe according to claim 1, is characterized in that the power supply of described probe and signal export the Control card directly other with being arranged on monitored axle system by aviation plug and be connected, realizes communication.