Optical fiber speed sensor

Abstract

The present invention provides an optical fiber rotation speed sensor, comprising an optical fiber acquisition end, an optical fiber and an optical fiber processing module; the optical fiber comprises a light source optical fiber and a light receiving optical fiber; the optical fiber acquisition end comprises a rotating shaft, a code disc and an optical fiber fixing seat; the code disc is arranged on the rotating shaft, and a plurality of light-transmitting holes and an opaque plate are provided on the code disc, the rotating shaft drives the code disc to continuously cut the light source optical fiber and the light receiving optical fiber correspondingly arranged on the optical fiber fixing seat, so as to form an optical pulsation signal proportional to the rotation speed; the optical pulsation signal is converted into an electrical signal required by a train monitoring device through an optical / electrical conversion circuit, a filtering and amplifying circuit, a voltage comparison circuit, a driving circuit and an output circuit of the optical fiber processing module, and the corresponding rotation speed parameter is measured; in addition, the optical fiber acquisition end and the optical fiber processing module of the device of the present application transmit signals through optical fibers, which effectively overcomes the problem that the existing photoelectric sensor uses cables to transmit signals and is easily interfered by electromagnetic voltage to cause signal abnormalities.

Description

Technical Field

[0001] The invention relates to an optical fiber sensor, in particular to an optical fiber rotation speed sensor. Background Art

[0002] The train operation monitoring device (LKJ for short) is an important driving safety control device used to prevent trains from overshooting signals and overspeeding, and the locomotive speed signal is one of the key signals for the reliable operation of the train operation monitoring device. At present, the speed sensors used for speed signal detection in locomotives mainly include photoelectric, Hall and magnetoelectric types; they are used in different environments.

[0003] Since the signal collection point and output plug point of the above-mentioned sensors are all transmitted by cables and electrical signals, it is impossible to achieve two-point isolation in the electromagnetic environment interference, cross-voltage and contact voltage interference; electromagnetic or voltage interference signal propagation of the above-mentioned sensors causes abnormal speed signals, and even affects the internal components of the sensor to cause secondary interference and damage, and burn monitoring equipment. In addition, existing photoelectric sensors all convert the collected optical pulse signals into electrical signals. The optical pulse signals mainly exist in two states: signal and no signal. The signal is relatively simple, resulting in poor accuracy in detecting the rotation speed; therefore, the industry is in urgent need of a new type of optical fiber rotation speed sensor. Summary of the invention

[0004] The object of the present invention is to provide an optical fiber rotation speed sensor to solve the problems of electromagnetic voltage interference and single signal in signal propagation of existing photoelectric sensors in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides an optical fiber rotation speed sensor, including an optical fiber collection end, an optical fiber and an optical fiber processing module; the optical fiber collection end is connected to the optical fiber processing module through an optical fiber; the optical fiber includes a light source optical fiber and a light receiving optical fiber, the light source optical fiber corresponds to the light receiving optical fiber and is arranged at intervals, and the light receiving optical fiber is used to receive and transmit the optical signal output by the light source optical fiber; the optical fiber collection end includes a rotating shaft, a code disk and an optical fiber fixing seat; the optical fiber fixing seat is provided with a groove for accommodating the light source optical fiber and the light receiving optical fiber; the code disk is provided with a plurality of light-transmitting holes and opaque plates of the same size and uniform spacing, the code disk is arranged on the rotating shaft, and the code disk is located at the interval between the light source optical fiber and the light receiving optical fiber; the rotating shaft drives the light-transmitting holes of the code disk The light-proof plate continuously cuts the light source path between the light source optical fiber and the light-receiving optical fiber to form a proportional light pulsation signal; the light-receiving optical fiber receives the pulsation signal and transmits it to the optical fiber processing module; the optical fiber processing module includes a circuit board assembly weldment and an optical / electric conversion circuit, a filtering and amplifying circuit, a voltage comparison circuit, a driving circuit and an output circuit integrated on the circuit board assembly weldment to convert the light pulsation signal into an electrical signal; the circuit assembly weldment is integrated with a light-emitting circuit and a power supply circuit, the light-emitting circuit is used to manufacture a light source, and the power supply circuit is respectively connected to the light / electric conversion circuit, the filtering and amplifying circuit, the voltage comparison circuit, the driving circuit, the output circuit and the light-emitting circuit for power supply to provide voltage.

[0006] Furthermore, the outlet of the light source optical fiber and the inlet of the light receiving optical fiber are spaced apart, and the spacing distance is 1 mm to 6 mm.

[0007] Furthermore, the number of light-transmitting holes and light-impermeable plates provided on the code disk is 1 to 200.

[0008] Furthermore, the number of the light source optical fibers and the light receiving optical fibers is multiple, the number of the light source optical fibers and the light receiving optical fibers is equal, and the light source optical fibers and the light receiving optical fibers are arranged in a one-to-one correspondence.

[0009] Furthermore, the optical fiber collection end includes a mounting seat, the mounting seat is provided with a mounting groove, the mounting groove is provided with a bearing seat for placing a rotating shaft; a code disk is provided at one end of the rotating shaft, the rotating shaft is fixed on the bearing seat through a bearing, and the other end of the rotating shaft is connected to the measured speed shaft through a coupling; the optical fiber fixing seat is fixed to the mounting groove by bolts or screws.

[0010] Furthermore, the optical fiber fixing seat includes an optical fiber base and an optical fiber pressing plate. The optical fiber base is provided with a groove for placing the light source optical fiber and the light receiving optical fiber. The optical fiber pressing plate is connected to the optical fiber base by bolts or screws. The optical fiber pressing plate is used to fix the light source optical fiber and the light receiving optical fiber placed in the groove.

[0011] Furthermore, a plurality of channels are provided on the optical fiber base, and one channel is provided with two coaxial light source optical fiber grooves and two coaxial light receiving optical fiber grooves; the plurality of channels are arranged around a code disk, along the light-transmitting holes and the opaque plates of the code disk, and the signals of the plurality of channels are arranged in sequence with a phase relationship of 45° to 135°.

[0012] Furthermore, an optical fiber rotation speed sensor includes an optical fiber sheath tube, which is wrapped around the optical fiber between the optical fiber collection end and the optical fiber processing module to protect the optical fiber.

[0013] The present invention has the following beneficial effects:

[0014] The present invention provides an optical fiber rotation speed sensor, comprising an optical fiber acquisition end, an optical fiber and an optical fiber processing module; the optical fiber comprises a light source optical fiber and a light receiving optical fiber; the optical fiber acquisition end comprises a rotating shaft, a code disc and an optical fiber fixing seat; the code disc is arranged on the rotating shaft, and the rotating shaft drives the code disc to make the light-transmitting hole and the opaque plate continuously cut the light source propagation path of the light source optical fiber and the light receiving optical fiber correspondingly arranged on the optical fiber fixing seat, so as to form an optical pulsation signal (the intensity signal of the light fluctuates around a certain average value) that is proportional to the rotation speed; the optical pulsation signal is converted into an electrical signal required by a train monitoring device through an optical / electrical conversion circuit, a filtering and amplifying circuit, a voltage comparison circuit, a driving circuit and an output circuit of the optical fiber processing module, and the corresponding rotation speed parameter is measured; at the same time, the device of the present application arranges the optical fiber acquisition end on the locomotive wheel axle, and the optical fiber processing module is arranged at the train signal receiving point, and the optical fiber acquisition end and the optical fiber processing module transmit signals through optical fiber, which effectively overcomes the problem that the existing photoelectric sensor uses a cable to transmit signals and is easily interfered by electromagnetic voltage to cause signal abnormality.

[0015] In the device of the present application, the optical fiber base is provided with a coaxially arranged light source optical fiber installation groove and a coaxially arranged light receiving optical fiber installation groove, and is locked and fixed by an optical fiber pressure plate; the layout space of the optical fiber is greatly optimized and the light source propagation loss in the optical fiber is reduced, thereby improving the quality of the optical signal.

[0016] The device of the present application arranges light source optical fibers and light receiving optical fibers of multiple channels along the light-transmitting holes of the code disk and around the opaque plate; the code disk can simultaneously cut the light source optical fibers and light receiving optical fibers of multiple channels, and the signals of the multiple channels are arranged in sequence with a phase relationship of 45° to 135°, so that the forward or reverse rotation of the shaft and the code disk can be identified. At the same time, multiple channels are arranged to obtain redundant information and selection for the train operation monitoring device, thereby solving the problem that the sensor cannot work due to damage to some channels.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of an optical fiber rotation speed sensor according to this embodiment;

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of the optical fiber fixing seat;

[0021] Figure 3 yes Figure 2 Schematic diagram of the middle code disk cutting the light source fiber and the light receiving fiber;

[0022] Figure 4 This is a schematic diagram of the structure of the optical fiber locker in this embodiment (without conversion connector);

[0023] Figure 5 yes Figure 4 The structural diagram of the photosensitive tube holder;

[0024] Figure 6 It is a schematic diagram of the optical pulse signal processing flow;

[0025] Figure 7 It is the first connection mode of the optical pulse signal pre-processing circuit diagram;

[0026] Figure 8 It is the second connection method of the optical pulse signal pre-processing circuit diagram;

[0027] Fig. 9 This is the circuit diagram of the post-processing of the optical pulsation signal;

[0028] Among them, 1. Fiber optic acquisition end, 1.1. rotating shaft, 1.2. code disc, 1.3. fiber optic fixing seat, 1.31. fiber optic base, 1.32. fiber optic pressure plate, 1.4. mounting seat, 2. optical fiber, 2.1. light source optical fiber, 2.2. light receiving optical fiber, 3. optical fiber processing module, 4. optical fiber sheath tube, 5. tube shell, 6. photosensitive tube seat, 6.1. plane structure, 6.2. groove, 7. locking tail cover. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0030] Reference Figures 1 to 3, an optical fiber speed sensor, comprising an optical fiber acquisition end 1, an optical fiber 2 and an optical fiber processing module 3; the optical fiber acquisition end 1 is connected to the optical fiber processing module 3 through the optical fiber 2; the optical fiber 2 comprises a light source optical fiber 2.1 and a light receiving optical fiber 2.2, the number of the light source optical fiber and the light receiving optical fiber is equal, and the light source optical fiber and the light receiving optical fiber are arranged in a one-to-one correspondence and interval, and the light receiving optical fiber is used to receive and transmit the optical signal output by the light source optical fiber; the optical fiber acquisition end 1 comprises a mounting seat 1.4, a rotating shaft 1.1, a code disc 1.2 and an optical fiber fixing seat 1.3; the mounting seat is provided with a mounting groove for accommodating the rotating shaft and the optical fiber fixing seat, and the mounting groove is provided with a bearing seat for accommodating the rotating shaft; a code disc is provided at one end of the rotating shaft, and the rotating shaft is fixed on the bearing seat through a bearing, and the other end of the rotating shaft is connected to the speed shaft to be measured through a coupling, and is connected to the locomotive wheel axle of the locomotive; the optical fiber fixing seat is fixed to the mounting groove by bolts or screws, and the optical fiber fixing seat 1.3 comprises an optical fiber base 1.31 and an optical fiber pressing plate 1.32; The optical fiber base is provided with grooves for accommodating the light source optical fiber and the light receiving optical fiber, and the optical fiber pressing plate is connected to the optical fiber base by screws, and the optical fiber pressing plate is used to fix the light source optical fiber and the light receiving optical fiber placed in the groove; the optical fiber base is provided with multiple channels, and one channel is composed of two coaxial "light source optical fibers" and "light receiving optical fibers", that is, one channel is provided with two coaxial light source optical fiber grooves and two coaxial light receiving optical fiber grooves; the multiple channels provided on the optical fiber base are arranged around a code disk, and the light-transmitting holes and the opaque plates on the code disk simultaneously cut the light source optical fibers and the light receiving optical fibers of multiple channels; at the same time, the signals of multiple channels are sequentially connected. The phase relationship is set to 45° to 135°, which can identify the forward or reverse rotation of the shaft and the code disk. At the same time, multiple channels can obtain redundant information and selection for the train operation monitoring device. For example, a total of four channels are designed, and only two channels are needed to obtain the train speed and train driving status. If one or two channels are damaged during operation, the train operation monitoring device can select the signals of the two or three channels that are not damaged for processing; or, two of the four channels are used as spare channels. When the two working channels are damaged, the spare channels are enabled; effectively avoiding the problem that the sensor cannot be used due to partial channel damage. The code disk is a circular code disk, and the edge of the circular code disk is evenly distributed with 200 light-transmitting holes and opaque plates of the same size (such as; a strip groove and a strip plate are alternately arranged), the code disk is set on the rotating shaft, and the code disk is located at the interval between the light source optical fiber and the light receiving optical fiber; the rotating shaft drives the light-transmitting holes and the opaque plates of the code disk to continuously cut the light source propagation path between the light source optical fiber and the light receiving optical fiber, forming a light pulsation signal that is proportional to the rotation speed (the light pulsation signal can indicate the intensity of the light. When the light spot in the light source path passes through the code disk, it is dispersed and passed through by multiple light-transmitting holes and opaque plates, forming a change in the intensity of the light; causing the light intensity signal to revolve around a certain plane The optical fiber receives the optical pulse signal and transmits it to the optical fiber processing module; the optical fiber processing module includes a circuit board assembly weldment and an optical / electric conversion circuit, a filter amplifier circuit, a voltage comparison circuit, a drive circuit, an output circuit, a light emitting circuit and a power supply circuit integrated on the circuit board assembly weldment. The optical / electric conversion circuit, the filter amplifier circuit, the voltage comparison circuit, the drive circuit and the output circuit are sequentially connected in series, and the optical pulse signal is sequentially processed by the optical / electric conversion circuit, the filter amplifier circuit, the voltage comparison circuit, the drive circuit and the output circuit to be converted into the electrical signal required by the train operation monitoring device, and the corresponding speed parameter is measured.

[0031] The power supply circuit and light-emitting circuit are integrated on the circuit board assembly; the light-emitting circuit includes a resistor and a light-emitting tube; the light-emitting tube is located at the entrance end of the light source optical fiber, and is used to emit light to produce a light source, and the light source is transmitted back to the light / electric conversion circuit in the optical fiber processing module through the light source optical fiber, the light-transmitting hole of the code disk, and the light-receiving optical fiber; the light-emitting tube is preferably a light-emitting diode or a laser emitting tube. The power supply circuit is respectively connected to the light / electric conversion circuit, the filter amplifier circuit, the voltage comparison circuit, the drive circuit, the output circuit, and the light-emitting circuit, and provides the circuit with reliable voltages V1 (equal to 12V to 30V), Vref1 (equal to 1 / 2 times V1), and 8V1 (equal to 8V).

[0032] The device of the present application comprises an optical fiber sheath tube, which is wrapped around the optical fiber between the optical fiber collection end and the optical fiber processing module to protect the optical fiber.

[0033] Reference Figures 4 to 5 The device of the present application also includes a fiber optic locker, which includes a conversion joint, a tube shell 5, a photosensitive tube seat 6 and a locking tail cover 7; the fiber optic processing module is arranged in the tube shell, the conversion joint is threadedly connected to one end of the tube shell, and the conversion joint is electrically connected to the fiber optic processing module, the photosensitive tube seat is arranged in the tube shell, and a mounting hole is provided on the photosensitive tube seat, one end of the mounting hole is used to insert the light-emitting tube, and the other end of the mounting hole is used to insert the optical fiber; the other end of the tube shell is provided with a first cone or frustum structure, and the first cone or frustum structure is provided with a plurality of intervals The slot extends along the length direction of the first cone or cone structure to form a locking blade structure; the locking tail cover is a hollow structure, and the locking tail cover is provided with a second cone or cone structure matching the first cone or cone structure on the tube shell, the locking tail cover is threadedly connected to the tube shell, the locking tail cover thread is tightened to squeeze the locking blade, and the locking blade is forced to press the photosensitive tube seat and the optical fiber; the conversion joint is preferably an aviation plug, and the electrical signal after the optical fiber processing module is transmitted to the external train monitoring device through the conversion joint, and then the locomotive speed is measured.

[0034] The photosensitive tube seat is made of elastic material; the photosensitive tube seat is preferably made of rubber material, and the photosensitive tube seat is preferably a columnar structure. The photosensitive tube seat is placed in the first cone or truncated cone structure of the tube shell, and at least two planar structures 6.1 arranged opposite to each other are arranged on the circumferential surface of the photosensitive tube seat; a groove 6.2 is arranged on the inner wall of the mounting hole of the photosensitive tube seat, and the groove extends along the length direction of the mounting hole; or, the mounting hole is a mounting hole with an adjustment gap, the adjustment gap is a notch of the mounting hole, and the adjustment gap extends along the length direction of the mounting hole; the design of the planar structure is conducive to the locking blade fitting the arc part of the photosensitive tube seat, which is convenient for the locking blade to squeeze the photosensitive tube seat; at the same time, the groove on the inner wall of the mounting hole can be used as a compression shape limit when the photosensitive tube seat squeezes the optical fiber, which is convenient for the photosensitive tube seat to squeeze and lock the optical fiber; or, the mounting hole is a mounting hole with an adjustment gap, the adjustment gap is the notch of the mounting hole, and after the photosensitive tube seat is subjected to force, the width of the adjustment gap of the mounting hole shrinks and becomes smaller or shrinks and closes, thereby locking the optical fiber.

[0035] The optical fiber locker of the device of the present application realizes reliable connection and locking of the optical fiber through the cooperation of the locking blades and the photosensitive tube seat; at the same time, the optical fiber locker of the device of the present application is designed to be cylindrical in shape, with an outer diameter slightly smaller than the aviation plug, and can integrate multiple optoelectronic components together, with multiple optical fiber pathways and a small volume, and is electrically connected to external locomotive equipment through a conversion connector to realize further transmission and processing of the signal after photoelectric conversion.

[0036] See also Figures 6 to 9 , the optical pulsation signal processing process of the light source fiber and the light receiving fiber:

[0037] The photoelectric conversion circuit and the filtering and amplifying circuit are connected in series to form a pre-stage processing circuit for the optical pulse signal. The photoelectric conversion circuit includes a phototube VJV (photovoltaic phototube); after the phototube VJV is connected in parallel with the capacitor C10, the positive electrode is connected to the reference voltage Vref1 point, and the negative electrode is connected to the inverting input terminal of the operational amplifier U12A; the filtering and amplifying circuit includes a capacitor C01, a resistor R18, and a first operational amplifier U12A; the resistor R18 is connected in parallel to the inverting input terminal and the output terminal of the first operational amplifier; the non-inverting input terminal of the first operational amplifier is connected to the reference voltage Vref1; the reference voltage Vref1=1 / 2V1, the phototube VJV converts the optical pulse signal transmitted from the light-receiving optical fiber into an electrical signal, which is amplified and output through the first operational amplifier after being filtered by the capacitor C01. Changing the resistance value of the resistor R18 can change the amplification factor, and the output Vout=Ivjv×R18+Vref1; see Figure 7 ;

[0038] Alternatively, the phototube of the photoelectric conversion circuit is a current-type phototube VJI, and the photoelectric conversion circuit and the filtering and amplifying circuit are connected in series via a coupling capacitor to form a pre-stage processing circuit for the light pulsation signal. The photoelectric conversion circuit includes a resistor R15 and a phototube VJI (current-type phototube); the resistor R15 is connected in series with the phototube VJI, and a capacitor C01 is connected in parallel to the phototube end; the filtering and amplifying circuit includes capacitors C01, C16, a resistor R16, a resistor R18, and a first operational amplifier U12A; the resistor R16 is connected in series with the inverting input end of the first operational amplifier, and the resistor R18 is connected in parallel to the first operational amplifier The inverting input terminal and output terminal of the first operational amplifier are connected; the non-inverting input terminal of the first operational amplifier is connected to the reference voltage Vref1; one end of the coupling capacitor C16 is connected in series with the resistor R16, and the other end of the coupling capacitor C16 is connected in series with the photoelectric tube VJI and the capacitor C01 connected in parallel with each other; the reference voltage Vref1 = 1 / 2V1, the capacitor C01 plays a filtering role, the signal in the photoelectric tube is converted into a voltage signal by combining with the resistor R15, and is amplified and output by the first operational amplifier through coupling with the coupling capacitor C16, and the output Vout ≈ R18 ÷ R16 × (8V1-Ivji × R15) + Vref1; see Figure 8 ;

[0039] The voltage comparison circuit, the driving circuit and the output circuit are connected in series in sequence to form a post-stage processing circuit for the signal. The voltage comparison circuit includes a resistor R17, a second operational amplifier U12B, and a resistor R14; the resistor R17 is connected in series to the non-inverting input terminal of the second operational amplifier, the resistor R14 is connected in parallel to the non-inverting input terminal and the output terminal of the second operational amplifier, and the inverting input terminal of the second operational amplifier is connected to the reference voltage Vref1; the driving circuit includes a resistor R19, a third operational amplifier U13A, and a resistor R120; the resistor R19 is connected in series to the non-inverting input terminal of the third operational amplifier, the resistor R120 is connected in parallel to the non-inverting input terminal and the output terminal of the third operational amplifier, and the inverting input terminal of the third operational amplifier is connected to the reference voltage Vref1. The inverting input terminal of the amplifier is connected to the reference voltage Vref1; the output circuit includes a resistor R121, a capacitor C17 and a dual diode D13; the dual diode is an integrated tube, and two diodes with the same parameters are connected in series inside, the series point is connected to the output circuit OUT1 point, and the other two poles are connected to G1 and V1 respectively to form a dual diode clamping circuit; one end of the resistor R121 is connected to the output end of the third operational amplifier and the other end is connected to OUT1 point, one end of the capacitor C17 is connected to OUT1 point and the other end is connected to G1, and the capacitor C17 plays a filtering role; by setting the dual diode clamping circuit, the output circuit has the functions of removing signal interference and protecting the circuit; see Fig. 9 .

[0040] It should be noted that V1 in the circuit represents the loaded voltage, and G1 represents the zero voltage; V1 and G1 represent the loaded voltage and the zero voltage in the first light source optical fiber and the light receiving optical fiber.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical fiber rotation speed sensor, characterized in that: It includes an optical fiber collection end, an optical fiber and an optical fiber processing module; the optical fiber collection end is connected to the optical fiber processing module through an optical fiber; the optical fiber includes a light source optical fiber and a light receiving optical fiber, the light source optical fiber corresponds to the light receiving optical fiber and is arranged at intervals, and the light receiving optical fiber is used to receive and transmit the optical signal output by the light source optical fiber; the optical fiber collection end includes a rotating shaft, a code disk and an optical fiber fixing seat; the optical fiber fixing seat is provided with a groove for accommodating the light source optical fiber and the light receiving optical fiber; the code disk is provided with a plurality of light-transmitting holes and light-proof plates of the same size and uniform spacing, the code disk is arranged on the rotating shaft, and the code disk is located at the interval between the light source optical fiber and the light receiving optical fiber; the rotating shaft drives the light-transmitting holes and the light-proof plates of the code disk to continuously cut the light source optical fiber The optical fiber and the light receiving optical fiber form a light pulse signal with a proportional relationship along the light source path between the optical fiber and the light receiving optical fiber; the light receiving optical fiber receives the pulse signal and transmits it to the optical fiber processing module; the optical fiber processing module includes a circuit board assembly and an optical / electric conversion circuit, a filtering and amplifying circuit, a voltage comparison circuit, a driving circuit and an output circuit integrated on the circuit board assembly, for converting the light pulse signal into an electrical signal; the circuit assembly is integrated with a light emitting circuit and a power supply circuit, the light emitting circuit is used to manufacture a light source, and the power supply circuit is respectively connected to the optical / electric conversion circuit, the filtering and amplifying circuit, the voltage comparison circuit, the driving circuit, the output circuit and the light emitting circuit for power supply, so as to provide voltage.

2. The optical fiber rotation speed sensor according to claim 1, characterized in that: The outlet of the light source optical fiber and the inlet of the light receiving optical fiber are arranged at intervals, and the interval distance is 1mm to 6mm.

3. The optical fiber rotation speed sensor according to claim 2, characterized in that: The number of light-transmitting holes and light-proof plates provided on the code disk is 1 to 200.

4. The optical fiber rotation speed sensor according to claim 3, characterized in that: The number of the light source optical fiber and the light receiving optical fiber is multiple, the number of the light source optical fiber and the light receiving optical fiber is equal, and the light source optical fiber and the light receiving optical fiber are arranged in a one-to-one correspondence.

5. The optical fiber rotation speed sensor according to claim 4, characterized in that: The optical fiber collection end includes a mounting seat, which is provided with a mounting groove, and the mounting groove is provided with a bearing seat for placing a rotating shaft; a code disk is provided at one end of the rotating shaft, and the rotating shaft is fixed on the bearing seat through a bearing, and the other end of the rotating shaft is connected to the measured speed shaft through a coupling; the optical fiber fixing seat is fixed to the mounting groove by bolts or screws.

6. The optical fiber rotation speed sensor according to claim 5, characterized in that: The optical fiber fixing seat includes an optical fiber base and an optical fiber pressing plate. The optical fiber base is provided with a groove for placing the light source optical fiber and the light receiving optical fiber. The optical fiber pressing plate is connected to the optical fiber base by bolts or screws. The optical fiber pressing plate is used to fix the light source optical fiber and the light receiving optical fiber placed in the groove.

7. The optical fiber rotation speed sensor according to claim 6, characterized in that: A plurality of channels are provided on the optical fiber base, and one channel is provided with two coaxial light source optical fiber grooves and two coaxial light receiving optical fiber grooves; the plurality of channels are arranged around a code disk, along the light-transmitting holes and the opaque plates of the code disk, and the signals of the plurality of channels are arranged in sequence with a phase relationship of 45° to 135°.

8. An optical fiber rotation speed sensor according to any one of claims 1 to 7, characterized in that: It includes an optical fiber sheath tube, which is wrapped around the optical fiber between the optical fiber collection end and the optical fiber processing module to protect the optical fiber.

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