Standard bar system and standard bar

Abstract

The utility model provides a standard bar system and a standard bar, the standard bar system comprises a standard bar and a measuring device, the standard bar comprises a bar body and a reflection module, the measuring device comprises a generation module and a processing module, the bar body comprises a first bar and a second bar, and the second bar is movably arranged on the first bar along the length direction of the bar body; the reflection module comprises a first reflection unit and a second reflection unit, and the first reflection unit and the second reflection unit are arranged on the first rod and the second rod respectively; wherein the first reflection unit is configured to receive the first light beam, reflect a part of the first light beam as a reference light beam to the processing module and transmit the other part of the first light beam to the second reflection unit, and the second reflection unit at least partially reflects the first light beam as a measurement light beam; the processing module obtains the length of the standard bar based on the reference beam and the measurement beam. According to the utility model, the standard bar system and the standard bar which are adjustable in length and high in accuracy can be provided.

Description

Technical Field

[0001] The utility model relates to the field of intelligent manufacturing equipment industry, and in particular to a standard rod system and a standard rod. Background Art

[0002] A standard rod is a tool used for calibration and measurement. It is widely used in the calibration and calibration of precision instruments such as laser interferometers and lidar scanners. The length of the standard rod is measured with a precision instrument and compared with the known standard length of the standard rod to calibrate the precision instrument.

[0003] Currently, there are two main types of standard rods. One type is a fixed-length standard rod. The length of this type of standard rod is pre-set and can be used for specific measurement needs. However, due to its fixed length, its application range is limited. To meet the needs of a wider range of applications, another type of standard rod with adjustable length has been developed. This standard rod allows users to freely adjust its overall length through an adjustment mechanism. The adjusted length of the standard rod is obtained by marking a scale on the rod body, hoping to adapt to more application scenarios.

[0004] However, in a standard rod with adjustable length, due to factors such as factory verification and / or human operation, the accuracy of the data obtained through measurement is low, which affects subsequent calibration. Summary of the Invention

[0005] The present invention is proposed in view of the above-mentioned prior art conditions, and its purpose is to provide a standard rod system and a standard rod with adjustable length and high accuracy.

[0006] To this end, a first aspect of the present invention provides a standard rod system, comprising a standard rod and a measuring device connected to the standard rod, the standard rod comprising a rod body and a reflection module, the measuring device comprising a generating module and a processing module, the rod body comprising a first rod and a second rod, the second rod being movably arranged on the first rod along the length direction of the rod body; the reflection module comprising a first reflecting unit and a second reflecting unit, the first reflecting unit being arranged on the first rod, and the second reflecting unit being arranged on the second rod; wherein the first reflecting unit is configured to receive a first light beam emitted by the generating module and reflect a portion of the first light beam as a reference beam to the processing module, and transmit another portion of the first light beam to the second reflecting unit, the second reflecting unit at least partially reflects the first light beam as a measuring beam, and the measuring beam is transmitted to the processing module via the first reflecting unit; the processing module obtains the length of the standard rod based on the reference beam and the measuring beam.

[0007] In a first aspect of the present invention, a standard rod includes a rod body and a reflection module, and the length of the rod body is adjustable. The length of the standard rod can be accurately measured by cooperating with the reflection module and a measuring device. Specifically, a first reflection unit and a second reflection unit of the reflection module are respectively arranged on the first rod and the second rod, and at least a part of the first light beam is reflected by the first reflection unit and the second reflection unit as a reference beam and a measuring beam respectively. The measuring device can obtain the distance between the first reflection unit and the second reflection unit based on the reference beam and the measuring beam, thereby accurately obtaining the length of the standard rod. Thus, a standard rod system with adjustable length and high accuracy can be provided.

[0008] In the calibration rod system according to the first aspect of the present invention, the measuring device can be detachably connected to the calibration rod. In this case, after the length of the calibration rod is measured using the measuring device, the measuring device can be separated from the calibration rod to facilitate calibration of equipment using the calibration rod alone.

[0009] Furthermore, in the calibration rod system according to the first aspect of the present invention, the distance between the calibration rod and the measuring device may optionally be no less than a preset distance. In this case, by ensuring that the distance between the calibration rod and the measuring device is no less than the preset distance, the measuring device is positioned as far away from the calibration rod as possible, thereby reducing the effect of the temperature generated by the measuring device on the light beam in the calibration rod to within an allowable error range, thereby improving the accuracy of the optical signal.

[0010] Additionally, the calibration rod system according to the first aspect of the present invention may optionally further include an optical fiber, through which the measuring device is connected to the calibration rod. In this case, because the optical fiber can be twisted and folded, compared to a calibration rod directly connected to the measuring device, the calibration rod can be more easily moved and used. Furthermore, the calibration rod can be easily moved away from the measuring device, thereby reducing the impact of heat generated by the measuring device on the calibration rod.

[0011] A second aspect of the present invention provides a standard rod, comprising a rod body and a reflection module, wherein the rod body comprises a first rod and a second rod, and the second rod is movably arranged on the first rod along the length direction of the rod body; the reflection module comprises a first reflection unit and a second reflection unit, the first reflection unit is arranged on the first rod, and the second reflection unit is arranged on the second rod, wherein the first reflection unit is configured to receive a first light beam emitted by an external device and reflect a portion of the first light beam as a reference beam to the external device, and transmit another portion of the first light beam to the second reflection unit, and the second reflection unit at least partially reflects the first light beam as a measurement beam, and the measurement beam is transmitted to the external device via the first reflection unit.

[0012] In the standard rod involved in the second aspect of the present invention, by movably setting the second rod on the first rod, the length of the rod body can be easily adjusted; the length of the adjusted rod body can be accurately measured through the cooperation of the reflection module and the external device. Specifically, the first reflection unit and the second reflection unit of the reflection module are respectively set on the first rod and the second rod, and the first reflection unit and the second reflection unit reflect at least part of the first light beam as a reference beam and a measurement beam respectively. The external device can obtain the distance between the first reflection unit and the second reflection unit based on the reference beam and the measurement beam, thereby accurately obtaining the length of the standard rod. Therefore, a standard rod with adjustable length and high accuracy can be provided.

[0013] In addition, in the standard rod according to the second aspect of the present invention, the rod body may optionally include a cavity, and the reflection module may be disposed in the cavity. This can reduce the influence of factors outside the rod on the light beam reflected by the reflection module, thereby improving the accuracy of the measurement result.

[0014] In addition, the calibration rod according to the second aspect of the present invention may optionally further include a first retroreflector disposed on the second rod. In this case, because the retroreflector can reflect the light beam emitted by the equipment in its original direction, a sensor on the equipment can accurately receive the reflected light beam. By moving the second rod to move the first retroreflector and obtaining the movement distance of the first retroreflector, calibration of the equipment can be facilitated.

[0015] In addition, the standard rod according to the second aspect of the present invention may optionally further include a reference retroreflector disposed on the first rod. Thus, equipment can be calibrated by obtaining the distance between the first retroreflector and the reference retroreflector, thereby improving the accuracy of equipment calibration using the standard rod.

[0016] In addition, the standard rod according to the second aspect of the present invention may optionally further include a collimator, through which the first light beam is emitted to the reflection module. In this case, the first light beam can be transformed into a parallel light beam by passing through the collimator, thereby improving the stability of the first light beam during propagation.

[0017] In addition, in the calibration rod according to the second aspect of the present invention, the rod body optionally includes an unlockable locking member that, when locked, restricts relative movement of the first rod and the second rod. In this case, the locking member can suppress undesirable movement of the first rod and the second rod during use (for example, undesirable movement caused by external factors during the process of moving the calibration rod to an instrument after length adjustment and measurement), thereby improving the accuracy of the calibration rod.

[0018] According to the utility model, a standard rod system and a standard rod with adjustable length and high accuracy can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will now be explained in further detail, by way of example only, with reference to the accompanying drawings.

[0020] Figure 1 2 is a diagram showing an application scenario of a standard rod system according to an example of the present utility model.

[0021] Figure 2 Schematic diagram showing a standard rod system according to an example of the present invention.

[0022] Figure 3 This is a schematic diagram showing a first embodiment of a standard club according to an example of the present invention.

[0023] Figure 4 Schematic diagram showing the optical path principle of the standard rod involved in the example of the present utility model.

[0024] Figure 5 This is a schematic diagram showing a second embodiment of a standard shaft according to an example of the present invention.

[0025] Figure 6 1 is a block diagram showing a measuring device according to an example of the present invention.

[0026] Figure 7 Schematic diagram showing calibration by a standard rod according to an example of the present invention.

[0027] Description of reference numerals:

[0028] 10…standard rod system, 1…standard rod, 11…rod body, 111…first rod, 112…second rod, 113…chamber, 114…locking piece, 12…reflection module, 121…first reflection unit, 122…second reflection unit, 13…first retroreflector, 14…reference retroreflector, 15…collimator, 2…measuring device, 21…generation module, 22…processing module, 23…first beam splitting unit, 24…feedback module, 25…fiber isolator, 26…coupling unit, 27…second beam splitting unit, 28…indicator light source, 29…wavelength division multiplexer, 3…optical fiber, 20…equipment and instrument, L1…first light beam, L2…reference beam, L3…measuring beam, A1…first distance, A2…second distance, A3…third distance. DETAILED DESCRIPTION

[0029] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. In the following description, identical components will be assigned identical reference numerals, and duplicate descriptions will be omitted. In addition, the accompanying drawings are merely schematic, and the proportions of the dimensions of the components or the shapes of the components may differ from the actual ones.

[0030] It should be noted that the terms "include" and "have" and any variations thereof in the present invention, such as a process, method, system, product or device that includes or has a series of steps or units, are not necessarily limited to those steps or units clearly listed, but may include or have other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0031] First, the relevant terms involved in this utility model are introduced.

[0032] "Accuracy" can refer to the degree of closeness between the obtained par length and the actual par length. For example, the closer the obtained length is to the actual length, the higher the accuracy of the par. It should be noted that due to measurement errors, the actual par length cannot be determined. Therefore, it can be considered that the smaller the influence of error factors during the length determination process, the closer the obtained par length is to the actual par length, i.e., the higher the accuracy of the par. In this utility model, the length of the par measured by the measuring device is referred to as the standard length of the par. Unless otherwise specified, the length of the par can refer to the standard length of the par.

[0033] The standard rod and standard rod system of the present invention can improve the flexibility and accuracy of the standard rod, thereby meeting various application scenarios and precision requirements. In some examples, the standard rod system of the first aspect of the present invention can also be referred to as a standard golf rod system, a standard ruler system, or a calibration rod system, and the standard rod of the second aspect of the present invention can also be referred to as a standard golf rod, a standard ruler, or a calibration rod.

[0034] The following describes in detail the standard rod and standard rod system involved in the present invention with reference to the accompanying drawings.

[0035] Figure 1 : is a diagram showing an application scenario of the standard rod system 10 involved in the example of the present utility model. Figure 1 In the figures, the structures of the standard rod system 10 and the standard rod 1 are simplified for a clearer illustration, but this should not be construed as limiting the present invention.

[0036] In some examples, the standard rod system 10 may include a standard rod 1 (see Figure 1In some examples, the standard rod 1 may have a standard length. The standard length refers to a length value determined by the standard rod 1 when it leaves the factory or after verification by an authoritative organization, and can be used as a reference in the calibration process. In some examples, the standard rod 1 can be used to calibrate the equipment 20 (see Figure 1 ). Thus, the accuracy of the equipment device 20 can be improved.

[0037] For some examples, see Figure 1 The length of the standard rod 1 can be measured by the device instrument 20, and the length of the standard rod 1 measured by the device instrument 20 can be compared with the standard length of the standard rod 1, so as to calibrate the device instrument 20.

[0038] In some examples, the length change value of the standard rod 1 can also be measured by the device instrument 20, and the length change value measured by the device instrument 20 is compared with the change value of the standard length of the standard rod 1, so as to calibrate the device instrument 20.

[0039] In some examples, the equipment instrument 20 may be a precision measuring instrument, such as a laser interferometer, a laser tracker, or a laser radar scanner.

[0040] Figure 2 1 is a schematic diagram showing a standard rod system 10 according to an example of the present invention.

[0041] For some examples, see Figure 2 The standard rod system 10 may include a measuring device 2. The measuring device 2 may be used to measure the length of the standard rod 1. In some examples, the measuring device 2 may be used to obtain the standard length of the standard rod 1. In some examples, the measuring device 2 may emit a first light beam L1 (see Figure 2 In some examples, the first light beam L1 may be a laser beam. In some examples, the first light beam L1 may be a frequency modulated continuous wave or pulsed laser.

[0042] In some examples, the measuring device 2 can be connected to the standard rod 1. In other words, the standard rod 1 can be connected to the measuring device 2.

[0043] In some examples, the standard rod 1 can be detachably connected to the measuring device 2. In this case, after measuring the length of the standard rod 1 using the measuring device 2, the measuring device 2 can be separated from the standard rod 1 to facilitate calibration of the equipment 20 using the standard rod 1 alone.

[0044] In some examples, the standard rod 1 may be fixedly connected to the measuring device 2. In this case, by measuring the length of the standard rod 1 in real time by the measuring device 2, different equipment and instruments 20 can be calibrated without disassembling the standard rod 1, thereby simplifying the calibration process of the standard rod 1.

[0045] In some examples, the standard rod 1 may reflect at least a portion of the first light beam L1 to the measuring device 2. In some examples, the measuring device 2 may measure the length of the standard rod 1 based on at least a portion of the first light beam L1 reflected by the standard rod 1.

[0046] In some examples, the distance between standard rod 1 and measuring device 2 may be no less than a preset distance. In this case, by ensuring that the distance between standard rod 1 and measuring device 2 is no less than the preset distance, measuring device 2 is positioned as far away from standard rod 1 as possible. This reduces the impact of the temperature generated by measuring device 2 on the light beam in standard rod 1 to within an allowable error range, thereby improving the accuracy of the optical signal.

[0047] In some examples, the preset distance may be configured as a distance at which the influence of the temperature generated by the measuring device 2 on the light beam in the standard rod 1 is reduced to within an allowable error range.

[0048] For some examples, see Figure 2 , the standard rod system 10 may include an optical fiber 3. In some examples, the optical fiber 3 may connect the standard rod 1 and the measuring device 2.

[0049] Figure 3 1 is a schematic diagram showing a first embodiment of a par 1 according to an example of the present invention.

[0050] In some examples, the standard club 1 may include a club body 11 (see Figure 3 In some examples, the rod body 11 may be a telescopic rod. In some examples, the rod body 11 may be made of a carbon fiber material.

[0051] For some examples, see Figure 3 The rod body 11 may include a first rod 111 and a second rod 112. In some examples, the second rod 112 may be movably disposed on the first rod 111 along the length direction of the rod body 11. In some examples, the second rod 112 may be movable relative to the first rod 111 along the length direction of the rod body 11.

[0052] In some examples, the first rod 111 and the second rod 112 can be coaxially arranged. In some examples, the first rod 111 can be sleeved on the second rod 112.

[0053] For some examples, see Figure 3 The rod body 11 may include a cavity 113. In some examples, the cavity 113 may be located inside the rod body 11.

[0054] For some examples, see Figure 3 , the rod body 11 may include an unlockable locking member 114 .

[0055] In some examples, the locking member 114 can limit relative movement between the first rod 111 and the second rod 112 when locked. In this case, the locking member 114 can suppress unwanted relative movement between the first rod 111 and the second rod 112 during use (for example, unwanted movement caused by external factors during the process of moving the standard rod 1 to the equipment 20 after length adjustment and measurement), thereby improving the accuracy of the standard rod 1.

[0056] In some examples, the locking member 114 may be a screw.

[0057] For some examples, see Figure 3 , the standard rod 1 may include a reflection module 12 .

[0058] In some examples, the reflection module 12 may be disposed in the chamber 113. This can reduce the influence of factors outside the rod body 11 on the light beam reflected by the reflection module 12, thereby improving the accuracy of the measurement result.

[0059] For some examples, see Figure 3 The reflection module 12 may include a first reflection unit 121 and a second reflection unit 122 .

[0060] Figure 4 1 is a schematic diagram showing the optical path principle of the standard rod 1 involved in the example of the present utility model.

[0061] In some examples, the first reflective unit 121 and the second reflective unit 122 can reflect the first light beam L1. Specifically, in some examples, see Figure 4 , the first reflecting unit 121 can be configured to receive the first light beam L1 and reflect a portion of the first light beam L1 as a reference beam L2. In some examples, the first reflecting unit 121 can transmit another portion of the first light beam L1 (i.e., light beam L1') to the second reflecting unit 122. In some examples, the second reflecting unit 122 can at least partially reflect the first light beam L1 as a measuring beam L3. In this case, at least a portion of the first light beam L1 is reflected by the first reflecting unit 121 and the second reflecting unit 122 as the reference beam L2 and the measuring beam L3, respectively, and the optical path difference between the reference beam L2 and the measuring beam L3 is calculated, thereby accurately obtaining the distance between the first reflecting unit 121 and the second reflecting unit 122 to obtain the length of the standard rod 1, thereby improving the accuracy of the standard rod 1.

[0062] In some examples, the length of the standard rod 1 may be the distance between the first reflecting unit 121 and the second reflecting unit 122. In other words, the standard length of the standard rod 1 may be the distance between the first reflecting unit 121 and the second reflecting unit 122.

[0063] In some examples, first reflective unit 121 receiving first light beam L1 may mean that first light beam L1 propagates to first reflective unit 121. In some examples, first light beam L1 may be emitted by an external device. In some examples, the external device may be measurement device 2. In some examples, measurement beam L3 may be transmitted to the external device via first reflective unit 121.

[0064] As described above, the second rod 112 can be movably disposed on the first rod 111 along the length direction of the rod body 11. In some examples, see Figure 3 , the first reflecting unit 121 can be set on the first rod 111. In some examples, the second reflecting unit 122 can be set on the second rod 112. In this case, by movably setting the second rod 112 on the first rod 111, the length of the rod body 11 can be easily adjusted; the adjusted length of the rod body 11 can be accurately measured by the cooperation of the reflecting module 12 and the external device. Specifically, the first reflecting unit 121 and the second reflecting unit 122 of the reflecting module 12 can be respectively set on the first rod 111 and the second rod 112, and at least part of the first light beam L1 can be reflected by the first reflecting unit 121 and the second reflecting unit 122 as the reference beam L2 and the measuring beam L3 respectively. The external device can obtain the distance between the first reflecting unit 121 and the second reflecting unit 122 based on the reference beam L2 and the measuring beam L3, thereby accurately obtaining the length of the standard rod 1. Thus, a standard rod 1 with adjustable length and high accuracy can be provided.

[0065] In some examples, when projected along the length of the rod 11 , the first reflective unit 121 may at least partially overlap with the second reflective unit 122 , thereby facilitating the portion of the first light beam L1 transmitted by the first reflective unit 121 to propagate to the second reflective unit 122 .

[0066] In some examples, the first reflecting unit 121 and the second reflecting unit 122 may be fixedly disposed on the first rod 111 and the second rod 112 , respectively.

[0067] For some examples, see Figure 3 , the standard rod 1 may include a first retroreflector 13 .

[0068] In some examples, the first retroreflector 13 may be disposed on the second rod 112. In this case, because the retroreflector can reflect the light beam emitted by the device 20 in its original direction, the sensor on the device 20 can accurately receive the reflected light beam. By moving the second rod 112 to move the first retroreflector 13 and obtaining the movement distance of the first retroreflector 13, the device 20 can be easily calibrated.

[0069] In some examples, the second reflecting unit 122 may be fixedly disposed on the first retroreflector 13 .

[0070] Figure 5 This is a schematic diagram showing a second embodiment of a par 1 according to an example of the present invention.

[0071] For some examples, see Figure 5 , the standard rod 1 may include a reference retroreflector 14 .

[0072] In some examples, reference retroreflector 14 may be provided on first rod 111. Thus, device 20 can be calibrated by obtaining the distance between first retroreflector 13 and reference retroreflector 14, which helps improve the accuracy of calibrating device 20 using standard rod 1.

[0073] In some examples, the first retroreflector 13 and the reference retroreflector 14 may be target balls with relatively strong reflectivity.

[0074] In the following, description will be given by taking an example in which the standard rod 1 includes the first retroreflector 13 and the reference retroreflector 14 .

[0075] In some examples, when the second reflective unit 122 is fixedly mounted on the first retroreflector 13 and the first reflective unit 121 is fixedly mounted on the reference retroreflector 14, the apparatus 20 measures the distance between the apparatus 20 and the first retroreflector 13 and the distance between the apparatus 20 and the reference retroreflector 14 to obtain the distance between the first retroreflector 13 and the reference retroreflector 14, and compares the distance with the distance between the first reflective unit 121 and the second reflective unit 122. In this case, calculating the difference between the distance between the apparatus 20 and the first retroreflector 13 and the distance between the apparatus 20 and the reference retroreflector 14 can help eliminate errors caused by external factors (such as temperature), thereby improving the accuracy of calibrating the apparatus 20 using the standard rod 1. Furthermore, the apparatus 20 can be calibrated without moving the second rod 112, thereby reducing the number of calibration steps and facilitating calibration.

[0076] In some examples, in addition to first retroreflector 13 and reference retroreflector 14, multiple retroreflectors may be provided on rod body 11. In this case, since different retroreflectors can be spaced at different intervals, multiple standard lengths can be simultaneously established. Multiple calibrations of equipment and instruments 20 can be performed using standard rod 1 to reduce accidental errors and improve calibration accuracy.

[0077] For some examples, see Figure 3 , the standard rod 1 may include a collimator 15 .

[0078] In some examples, the first light beam L1 can be emitted to the reflection module 12 via the collimator 15 , so that the first light beam L1 can be transformed into a parallel light beam by passing through the collimator 15 .

[0079] In some examples, the reference beam L2 and the measuring beam L3 may be received by an external device via the collimator 15 .

[0080] Figure 6 1 is a block diagram showing a measuring device 2 according to an example of the present invention.

[0081] For some examples, see Figure 4 or Figure 6 , the measuring device 2 may include a generating module 21 .

[0082] In some examples, the measuring device 2 can emit a first light beam L1. In some examples, the generating module 21 can be configured to emit the first light beam L1.

[0083] For some examples, see Figure 4 or Figure 6 , the measuring device 2 may include a processing module 22 .

[0084] In some examples, the measuring beam L3 may be transmitted to the processing module 22 via the first reflecting unit 121. In some examples, the processing module 22 may receive the reference beam L2 and the measuring beam L3.

[0085] In some examples, the processing module 22 can determine the length of the standard rod 1 based on the reference beam L2 and the measuring beam L3. In this case, the first light beam L1 is emitted by the generating module 21, and is received and reflected by the reflecting module 12, at least a portion of which is used as the reference beam L2 and the measuring beam L3. When the reference beam L2 and the measuring beam L3 are reflected to the processing module 22 of the measuring device 2, the processing module 22 can process the reference beam L2 and the measuring beam L3 to measure the length of the standard rod 1.

[0086] In some examples, the reference beam L2 and the measuring beam L3 may have the same outgoing optical path and receiving optical path.

[0087] For some examples, see Figure 4 The measurement device 2 may include a first beam splitting unit 23 and a feedback module 24. In some examples, the first beam splitting unit 23 may split the first light beam L1 emitted by the generating module 21 into two light beams. In some examples, one light beam may be emitted to the standard rod 1, and the other light beam may be emitted to the feedback module 24. The feedback module 24 may then calibrate the frequency modulation frequency of the generating module 21 based on the other light beam.

[0088] For some examples, see Figure 4 The measurement device 2 may include a fiber optic isolator 25 disposed between the generating module 21 and the first beam splitting unit 23. In some examples, the fiber optic isolator 25 may be used to isolate the reverse propagating optical signal. In this case, the fiber optic isolator 25 can isolate the light beam reflected by other optical components.

[0089] For some examples, see Figure 4 The measuring device 2 may include a coupling unit 26. In some examples, the processing module 22 may be coupled to the measuring optical path of the measuring device 2 via the coupling unit 26. In some examples, the optical path through which the first light beam L1 passes is referred to as the measuring optical path.

[0090] In some examples, the coupling unit 26 can guide the first light beam L1 to be transmitted to the standard rod 1, and guide the reference light beam L2 and the measurement light beam L3 to be transmitted to the processing module 22. In some examples, the coupling unit 26 can be disposed between the generating module 21 and the standard rod 1. In some examples, the coupling unit 26 can be a circulator.

[0091] For some examples, see Figure 4 The measuring device 2 may include a second beam splitting unit 27. In some examples, the second beam splitting unit 27 may split the optical path into two paths, which are received by two channels of the processing module 22. This facilitates differential processing by the processing module 22.

[0092] For some examples, see Figure 4 The measuring device 2 may include an indicator light source 28. In some examples, the indicator light source 28 may be a laser light source, and the indicator light beam may be a laser beam. In some examples, the indicator light beam may be a visible light beam.

[0093] For some examples, see Figure 4 The measuring device 2 may include a wavelength division multiplexer 29. In some examples, the indicator light source 28 may be coupled into the measuring light path via the wavelength division multiplexer 29. Thus, the indicator light beam and the first light beam L1 may be emitted to the standard rod 1 together.

[0094] In some examples, return to see Figure 2 , the measuring device 2 can be connected to the standard rod 1 via an optical fiber 3. In this case, because the optical fiber 3 can be twisted and folded, compared with a direct connection between the standard rod 1 and the measuring device 2, the standard rod 1 can be moved and used more easily. At the same time, the standard rod 1 can be easily kept away from the measuring device 2, thereby reducing the impact of heat generated by the measuring device 2 on the standard rod 1.

[0095] As described above, the standard rod system 10 may include an optical fiber 3. In some examples, the optical fiber 3 may transmit the first light beam L1 emitted by the measuring device 2 to the standard rod 1. In some examples, the optical fiber 3 may be an armored optical fiber.

[0096] Figure 7 Schematic diagram showing calibration by a standard rod 1 according to an example of the present invention.

[0097] The calibration process will be described below by taking the first embodiment of the standard rod 1 as an example.

[0098] For some examples, see Figure 7 , the distance measured by the instrument 20 from the first retroreflector 13 before movement is defined as first distance A1; the distance moved by the second rod 112 is defined as second distance A2. Since the first retroreflector 13 is disposed on the second rod 112, the distance moved by the first retroreflector 13 is equal to second distance A2; the distance measured by the instrument 20 from the first retroreflector 13 after movement is defined as third distance A3. The instrument 20 is calibrated by calculating the difference between the third distance A3 and the first distance A1 and comparing the difference with the second distance A2. In some examples, the second distance A2 may be the standard length of the standard rod 1.

[0099] In the present invention, in the standard rod system 10 involved in the first aspect, the standard rod 1 includes a rod body 11 and a reflection module 12. The length of the rod body 11 is adjustable. The length of the standard rod 1 can be accurately measured through the cooperation of the reflection module 12 and the measuring device 2. Specifically, the first reflection unit 121 and the second reflection unit 122 of the reflection module 12 are respectively arranged on the first rod 111 and the second rod 112. The first reflection unit 121 and the second reflection unit 122 reflect at least part of the first light beam L1 as the reference beam L2 and the measurement beam L3 respectively. The measuring device 2 can obtain the distance between the first reflection unit 121 and the second reflection unit 122 based on the reference beam L2 and the measurement beam L3, so as to accurately obtain the length of the standard rod 1. Therefore, a standard rod system 10 with adjustable length and high accuracy can be provided. In the standard rod 1 involved in the second aspect, by movably setting the second rod 112 on the first rod 111, the length of the rod body 11 can be easily adjusted; the length of the adjusted rod body 11 can be accurately measured by cooperating with the reflection module 12 and the external device. Specifically, the first reflection unit 121 and the second reflection unit 122 of the reflection module 12 are respectively set on the first rod 111 and the second rod 112, and the first reflection unit 121 and the second reflection unit 122 reflect at least part of the first light beam L1 as the reference beam L2 and the measurement beam L3 respectively. The external device can obtain the distance between the first reflection unit 121 and the second reflection unit 122 based on the reference beam L2 and the measurement beam L3, so as to accurately obtain the length of the standard rod 1, thereby providing a standard rod 1 with adjustable length and high accuracy.

[0100] In summary, according to the present invention, a standard rod system 10 and a standard rod 1 with adjustable length and high accuracy can be provided.

[0101] Although the present invention has been described in detail above with reference to the accompanying drawings and examples, it should be understood that the above description does not limit the present invention in any form. Those skilled in the art may modify and alter the present invention as needed without departing from the spirit and scope of the present invention, and such modifications and alterations are intended to fall within the scope of the present invention.

Claims

1. A standard rod system, characterized in that: The invention comprises a standard rod and a measuring device connected to the standard rod, wherein the standard rod comprises a rod body and a reflection module, and the measuring device comprises a generating module and a processing module, wherein the rod body comprises a first rod and a second rod, and the second rod is movably arranged on the first rod along the length direction of the rod body; the reflection module comprises a first reflecting unit and a second reflecting unit, the first reflecting unit is arranged on the first rod, and the second reflecting unit is arranged on the second rod; wherein the first reflecting unit is configured to receive a first light beam emitted by the generating module and reflect a part of the first light beam as a reference beam to the processing module, and transmit another part of the first light beam to the second reflecting unit, the second reflecting unit at least partially reflects the first light beam as a measuring beam, and the measuring beam is transmitted to the processing module via the first reflecting unit; the processing module obtains the length of the standard rod based on the reference beam and the measuring beam.

2. The standard rod system according to claim 1, wherein: The measuring device is detachably connected to the standard rod.

3. The standard rod system according to claim 1, wherein: The distance between the standard rod and the measuring device may be no less than a preset distance.

4. The standard rod system according to claim 1, wherein: It also includes an optical fiber, through which the measuring device is connected to the standard rod.

5. A standard rod, characterized in that: The invention comprises a rod body and a reflection module, wherein the rod body comprises a first rod and a second rod, and the second rod is movably arranged on the first rod along the length direction of the rod body; the reflection module comprises a first reflection unit and a second reflection unit, the first reflection unit is arranged on the first rod, and the second reflection unit is arranged on the second rod, wherein the first reflection unit is configured to receive a first light beam emitted by an external device and reflect a part of the first light beam as a reference beam to the external device, and transmit another part of the first light beam to the second reflection unit, and the second reflection unit at least partially reflects the first light beam as a measurement beam, and the measurement beam is transmitted to the external device via the first reflection unit.

6. The standard rod according to claim 5, wherein: The rod body includes a cavity, and the reflection module is arranged in the cavity.

7. The standard rod according to claim 5, wherein: Also included is a first retroreflector disposed on the surface of the second rod.

8. The standard rod according to claim 7, wherein: Also included is a reference retroreflector disposed on the first rod.

9. The standard club according to claim 5, wherein: A collimator is further included, and the first light beam is emitted to the reflection module via the collimator.

10. The standard club according to claim 5, wherein: The rod body includes an unlockable locking member, which restricts relative movement of the first rod and the second rod when locked.

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