A measuring device

Abstract

This utility model discloses a measuring device in the field of measuring devices. The measuring device includes a measuring probe, an ambient light compensation circuit, and a controller. The measuring probe includes an aligned and spaced-apart transmitter and a receiver. A compensation tube is provided on the side of the receiver. The ambient light compensation circuit is used to convert the transmitter signal and the ambient light signal received by the receiver into a first signal, convert the ambient light signal received by the compensation tube into a second signal, subtract the second signal from the first signal and amplify it into a third signal, and compare the third signal with a threshold signal to obtain a result signal. The measuring device provided by this utility model improves measurement accuracy by setting a compensation tube on the side of the receiver. The receiver receives both the transmitter signal and the ambient light signal, while the compensation tube only receives the ambient light signal. The ambient light compensation circuit in the measuring device eliminates the influence of the ambient light signal on the result signal.

Description

Technical Field

[0001] This utility model relates to the field of measuring devices, and more particularly to a measuring device. Background Technology

[0002] Photoelectric coordinate measuring machines are widely used for monitoring horizontal displacement and deformation, such as the monitoring of horizontal displacement and deflection in dams, ship locks, and high-rise buildings. They are used in conjunction with plumb lines, inverted plumb lines, and their devices. When in use, the photoelectric coordinate measuring machine scans the reference rod and the measured line through the probe. The receiving component inside the probe receives both the infrared signal from the transmitting component and ambient light from the surrounding environment. This makes it difficult to accurately determine whether the signal received by the receiving component is an ambient light signal or an infrared signal, thus affecting the accuracy of the detection data. Utility Model Content

[0003] The purpose of this invention is to provide a measuring device that eliminates the influence of ambient light on the measurement by setting up compensation and ambient light supplementation circuits, thereby improving the measurement accuracy.

[0004] To solve the above technical problems, the following technical solution is adopted:

[0005] This utility model provides a measuring device, which includes a measuring probe, an ambient light compensation circuit, and a controller;

[0006] The measuring probe includes an aligned and spaced-apart transmitting tube and a receiving tube, with a compensation tube on the side of the receiving tube. The measuring probe moves under the action of a driving force, and the gap between the transmitting tube and the receiving tube is used to pass through the scanning object.

[0007] The ambient light compensation circuit is used to convert the transmitter signal and ambient light signal received by the receiver tube into a first signal, convert the ambient light signal received by the compensation tube into a second signal, subtract the second signal from the first signal and amplify it into a third signal, and compare the third signal with a threshold signal to obtain a result signal.

[0008] The controller calculates the displacement data based on the time interval between the result signals and the moving speed of the measuring probe.

[0009] Optionally, the transmitting tube includes a straight transmitting tube and an oblique transmitting tube, and the receiving tube includes a straight receiving tube and an oblique transmitting tube. The signal emitted by the straight transmitting tube is received by the straight receiving tube, and the straight transmitting tube and the straight receiving tube are aligned in the straight direction.

[0010] The signal emitted by the angled transmitting tube is received by the angled receiving tube, and the angled transmitting tube and the angled receiving tube are arranged obliquely aligned.

[0011] The compensation tube includes a straight compensation tube and an oblique compensation tube. The straight compensation tube is disposed on the side of the straight receiving tube, and the oblique compensation tube is disposed on the side of the oblique receiving tube.

[0012] Optionally, the ambient light compensation circuit uses a receiving tube circuit to convert the transmitting tube signal and the ambient light signal into a first signal, and a compensation tube circuit to convert the ambient light signal into a second signal.

[0013] The receiving tube circuit includes a sampling resistor and a voltage follower. The voltage follower is used in the first signal lossless input differential amplifier circuit. One end of the sampling resistor is grounded, and the other end is connected to the first end of the receiving tube. The second end of the receiving tube is connected to the power supply.

[0014] The compensation transistor circuit includes sampling resistor two and voltage follower two. The voltage follower one is used in the second signal lossless input differential amplifier circuit. One end of sampling resistor two is grounded, and the other end is connected to the first end of the compensation transistor. The second end of the compensation transistor is connected to power supply two.

[0015] Optionally, in the ambient light compensation circuit, a differential amplifier circuit is used to subtract the second signal from the first signal and amplify it into a third signal. A comparison circuit is used to compare the third signal with a threshold signal to obtain the result signal.

[0016] Optionally, the measurement probe further includes a heating assembly for heating the environment in which the transmitting tube, receiving tube, and compensation tube are located.

[0017] Optionally, the result signal includes a high level and a low level, wherein the high level indicates that the measuring probe did not scan the object, and the low level indicates that the measuring probe scanned the object.

[0018] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0019] 1. The measuring device provided by this utility model has a compensation tube set on the side of the receiving tube. The receiving tube receives the signal emitted by the transmitting tube and the ambient light signal, while the compensation tube only receives the ambient light signal. The measuring device also includes an ambient light compensation circuit. The signal in the transmitting tube and the signal in the compensation tube are processed by the ambient light compensation circuit and the result signal is output. The ambient light compensation circuit subtracts the signal in the compensation tube from the signal in the transmitting tube, and the resulting signal is only the signal emitted by the transmitting tube received by the receiving tube, thus eliminating the influence of the ambient light signal on the result signal and improving the measurement accuracy.

[0020] 2. This utility model also includes a heating component inside the measuring device to provide a stable temperature field within the measuring device, thereby preventing external temperature from affecting the use of internal components and improving measurement accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic cross-sectional view of the measuring device in an embodiment of this utility model;

[0022] Figure 2 This is one of the structural schematic diagrams of the measuring device in use according to an embodiment of this utility model;

[0023] Figure 3 This is a coordinate diagram of the measured line body when the measuring device is working in this embodiment of the utility model;

[0024] Figure 4 This is the second schematic diagram of the measuring device in use in this utility model embodiment;

[0025] Figure 5 This is a schematic diagram of the vertical ambient light compensation circuit in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of an oblique ambient light compensation circuit in an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] Protective casing; 11. Transmitter board; 12. Receiver board; 2. Transmitter tube; 21. Straight transmitter tube; 22. Angled transmitter tube; 3. Receiver tube; 31. Straight receiver tube; 32. Angled receiver tube; 4. Compensation tube; 41. Straight compensation tube; 42. Angled compensation tube; 5. Heating assembly; 6. Receiver tube circuit; 61. Sampling resistor one; 62. Operational amplifier one; 63. Power supply one; 7. Compensation tube circuit; 71. Sampling resistor two; 72. Operational amplifier two; 73. Power supply two; 8. Differential amplifier circuit; 81. First resistor; 82. Second resistor; 83. Third resistor; 84. Fourth resistor; 85. Fifth resistor; 86. Sixth resistor; 87. Operational amplifier three; 88. Operational amplifier four; 89. Operational amplifier five; 810. Power supply three; 811. Capacitor one; 812. Adjustable resistor one; 9. Comparator circuit; 91. Operational amplifier six; 92. Seventh resistor; 93. Adjustable resistor two; 94. Eighth resistor; 95. Power supply four; 96. Power supply five; 97. Power supply six; 98. Capacitor two; 99. Capacitor three; 10. Transmitter circuit; 101. First operational amplifier; 102. Resistor one; 103. Resistor two; 104. Resistor three; 105. First capacitor; 106. First power supply; 107. Second power supply; 108. Transistor. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Example 1

[0032] This embodiment provides a measuring device, including a measuring probe and a motor. The motor drives the optical measuring probe to scan the measured line body, thereby obtaining the deformation displacement or deflection of the measured line body. The motor is a high-speed two-phase stepper motor, which has a simple structure and low cost.

[0033] like Figure 1 As shown, the measuring probe includes a protective shell 1, a transmitting tube 2, a receiving tube 3, and a heating assembly 5. The protective shell 1 includes a transmitting plate 11 and a receiving plate 12 arranged parallel to each other, and the transmitting plate 11 and the receiving plate 12 are connected by an intermediate plate.

[0034] A transmitter tube 2 is installed inside the transmitter plate 11. The transmitter tube 2 includes a straight transmitter tube 21 and an oblique transmitter tube 22. The straight transmitter tube 21 is located on the side of the oblique transmitter tube 22, and the oblique transmitter tube 22 is installed at an angle.

[0035] A receiving tube 3 is installed inside the receiving plate 12. The receiving tube 3 includes a straight receiving tube 31 and an oblique receiving tube 32. The straight receiving tube 31 and the oblique receiving tube 32 are arranged at intervals. The straight receiving tube 31 is located on the same straight line as the straight transmitting tube 21. The oblique receiving tube 32 is installed at an angle and is aligned with the oblique transmitting tube 22 at an angle.

[0036] A compensation tube 4 is also installed on the receiving plate 12. The compensation tube 4 includes a straight compensation tube 41 and an oblique compensation tube 42. The straight compensation tube 41 is installed on the side of the straight receiving tube 31, and the oblique compensation tube 42 is installed on the side of the oblique receiving tube 32. The oblique compensation tube 42 is obliquely arranged on the receiving plate 12 at the same angle as the oblique receiving tube 32.

[0037] Heating components 5 are provided in both the receiving plate 12 and the transmitting plate 11. The heating components 5 can provide a stable temperature field for the internal components, ensuring that the internal components work at the specified temperature, thereby improving the accuracy and reliability of the measurement. Compared with existing external heating, it uses less power and the heating effect is less affected by the external temperature.

[0038] The measuring device provided in this embodiment avoids the situation where the receiving component inside the probe receives ambient light from the surrounding environment while simultaneously receiving the infrared signal from the transmitting component, thus preventing the inability to accurately determine whether the signal received by the receiving component is an ambient light signal or an infrared signal, thereby improving the accuracy of the detection data. The included heating component further prevents external temperature from affecting the detection effect, further improving the accuracy of the detection data.

[0039] In the above scheme, the straight transmitting tube and straight receiving tube are used to measure the displacement of the target object in the X direction, and the oblique transmitting tube and oblique receiving tube are used to measure the displacement of the target object in the Y direction. The oblique transmitting tube and oblique receiving tube are installed aligned at a certain angle. This measuring device is a photoelectric vertical coordinate instrument, used to measure the displacement of the target object in the X and Y directions. When the device does not have oblique transmitting tubes and oblique receiving tubes, and also does not need to have oblique compensation tubes, the device is a tension line instrument, used to measure the displacement of the target object in one direction.

[0040] like Figure 2As shown, the first reference rod A and the second reference rod B are vertically separated from the measured line body. The installation angles of the oblique transmitting tube and the oblique receiving tube are known. Position L is the horizontal distance L between the measured line body and the straight infrared light. As shown in the figure, position L is set between the second reference rod B and the measured line body. When inputting position L, position L can also be set between the measured line body and the second reference rod B. When scanning the measured line body starts at position L, the horizontal and vertical displacements of the measured line body are calculated based on whether both the straight and oblique infrared lights are scanned to the measured line body.

[0041] like Figure 3 As shown, taking an angle of 45° between oblique infrared and linear infrared as an example, the first reference rod A and the second reference rod B are on the same straight line as the measured line body, and the angle between this straight line and the horizontal direction is 45°. The coordinates of the measured line body in the X and Y directions are:

[0042] X i =X1

[0043] Y i =X2-X1

[0044] Where: X1 and X2 are the values ​​measured by the vertical coordinate instrument;

[0045] The displacement values ​​of the measured line body in the X and Y directions are:

[0046] △X i =X i -X0

[0047] △Y i =Y i -Y0

[0048] Where X0 and Y0 are the initial measurements of the vertical coordinate instrument.

[0049] like Figure 4 The diagram shows a simplified structure of the tensioning instrument when measuring the conductor. After the first measurement, the measuring probe stays at position L, with the horizontal distance between the linear infrared beam on it and the conductor being measured being L. During the rapid measurement process, the linear infrared beam returns to position L after scanning the conductor being measured, thus measuring the distance from the conductor being measured to L, thereby obtaining the displacement of the conductor being measured.

[0050] The measuring device also includes an ambient light compensation circuit. Signals received by the receiving tube and the compensation tube are processed in this circuit. The compensation tube 4 and the receiving tube 3 use the same model of receiving tube 3. The compensation tube 4 can only receive ambient light, while the receiving tube 3 receives both ambient light and the infrared light signal emitted by the transmitting tube 2. The ambient light compensation circuit subtracts the ambient light signal from the compensation tube 4 from the mixed light signal in the receiving tube 3, outputting a result signal. This result signal indicates the scanning status of the measured line by the measuring probe. When the result signal is low, it indicates that the receiving tube 3 did not receive the infrared light signal emitted by the transmitting tube 2, meaning the line being measured is obstructing the view between the receiving tube 3 and the transmitting tube 2, and the line being measured has been scanned. When the result signal is high, it indicates that the line being measured has not been scanned.

[0051] The measuring device also includes a controller, which obtains the time interval between the start of scanning by the measuring probe and the scanning of the line body under test, and calculates the product of the time interval and the moving speed of the measuring probe to obtain the displacement of the line body under test relative to the reference position.

[0052] The ambient light compensation circuit includes an ambient light compensation circuit for the straight-emitting tube 21 and the straight-receiving tube 31 and an ambient light compensation circuit for the oblique-emitting tube 22 and the oblique-receiving tube 32. The two circuits are similar.

[0053] The ambient light compensation circuit specifically includes: a transmitter circuit 10, a receiver circuit 6, a compensation circuit 7, a differential amplifier circuit 8, and a comparator circuit 9. The output terminals of the receiver circuit 6 and the compensation circuit 7 are both connected to the input terminal of the differential amplifier circuit 8. The output terminal of the differential amplifier circuit 8 is connected to the input terminal of the comparator circuit 9. The output terminal of the comparator circuit 8 outputs a low level or a high level.

[0054] like Figure 5 , Figure 6 As shown, the transmitter circuit 10 includes a first operational amplifier 101, three resistors, a transistor, and two power supplies. The collector of the transistor 108 is connected to the transmitter 2, and the emitter is connected to the second power supply 107 through resistor 104. The base is connected to the output terminal of the first operational amplifier 101. The non-inverting input of the first operational amplifier 101 is connected between resistor 102 and resistor 103, and the inverting input is connected between the transistor and resistor 104. Resistors 102 and 103 are connected in series. One end of resistor 102 is connected to the second power supply 107, and one end of resistor 103 is grounded.

[0055] The first operational amplifier 101 in the linear transmitter circuit 10 also has a first terminal and a second terminal. The first terminal is grounded, and the second terminal is connected between the first power supply 106 and the first capacitor 105. The other end of the first capacitor 105 is grounded.

[0056] The transmitter circuit includes a straight transmitter circuit and an angled transmitter circuit. The transmitter 2 installed in the straight transmitter circuit is a straight transmitter 21, and the transmitter 2 installed in the angled transmitter circuit is an angled transmitter 22. Resistors 102 and 104 are 2K ohms, 103 and 104 respectively (ohms are omitted for brevity in the following resistor values). The first power supply 106 and the second power supply 107 are both 5V. Transistor 108 is a PNP transistor. The first operational amplifier 101 in the straight transmitter circuit 10 is U1A from the first LM324, and the first operational amplifier 101 in the angled transmitter circuit is U2C from the second LM324.

[0057] The first operational amplifier 101 clamps the voltage drop across the resistor 104 (100Ω) to approximately 2V (calculated using the following formula: (2k / (2k+3k))*5V), and then uses the transistor 108 to achieve a constant DC current drive for the emitter 2, with the current controlled at 20mA (calculated using the following formula: 2V / 100Ω).

[0058] The receiving transistor circuit 6 includes a sampling resistor 61, an operational amplifier 62, and a power supply 63. The receiving transistor 3 is an NPN transistor. The emitter of the receiving transistor 3 is connected to the sampling resistor 61, the other end of the sampling resistor 61 is grounded, the base is connected to the power supply 63, and the collector receives the infrared light signal from the transmitting transistor 2. The non-inverting input of the operational amplifier 62 is connected between the sampling resistor 61 and the receiving transistor 3, and the inverting input is connected to the output terminal.

[0059] The receiving transistor circuit 6 includes a straight receiving transistor circuit and an angled receiving transistor circuit. The receiving transistor 2 installed in the straight receiving transistor circuit is a straight receiving transistor 21, and the receiving transistor 2 installed in the angled receiving transistor circuit is an angled receiving transistor 22. The sampling resistor 61 is 3K, the power supply 63 is 5V, the operational amplifier 62 in the straight receiving transistor circuit is U1B in the first LM324, and the operational amplifier 62 in the angled receiving transistor circuit is U2D in the second LM324.

[0060] The compensation transistor circuit 7 includes a compensation transistor 4, a sampling resistor 71, an operational amplifier 72, and a power supply 73. The compensation transistor 4 is an NPN transistor, the same type as the receiving transistor 3. The emitter of the compensation transistor 4 is connected to the sampling resistor 71, the other end of the sampling resistor 71 is grounded, the base is connected to the power supply 73, and the collector receives ambient light. The non-inverting input of the operational amplifier 72 is connected between the sampling resistor 71 and the compensation transistor 4, and the inverting input is connected to the output.

[0061] The compensation transistor circuit 7 includes a direct compensation transistor circuit and a slant compensation transistor circuit. The compensation transistor 4 installed in the direct compensation transistor circuit is a direct compensation transistor 41, and the compensation transistor 4 installed in the slant compensation transistor circuit is a slant compensation transistor 42. The sampling resistor 71 is 3KΩ, and the power supply 73 is 5V. The operational amplifier 72 in the direct compensation transistor circuit is U1D in the first LM324, and the operational amplifier 72 in the slant compensation transistor circuit is U3B in the third LM324.

[0062] The differential amplifier circuit is a classic instrument differential amplifier circuit with three operational amplifiers, specifically including: first resistor 81, second resistor 82, third resistor 83, fourth resistor 84, fifth resistor 85, sixth resistor 86, operational amplifier three 87, operational amplifier four 88, operational amplifier five 89, power supply three 810, capacitor one 811, and adjustable resistor one 812; first resistor 81, second resistor 82, and third resistor 83 are connected in series, and fourth resistor 84, fifth resistor 85, and sixth resistor 86 are connected in series.

[0063] The non-inverting input of op-amp 387 is connected to the output of op-amp 162, the inverting input is connected to the first end of adjustable resistor 1812, and the output is connected between the first resistor 81 and the second resistor 82. The first end of the first resistor 81 is connected between the inverting input of op-amp 387 and adjustable resistor 1812.

[0064] The non-inverting input of op-amp 4 88 is connected to the output of op-amp 2 72, the inverting input is connected to the second terminal of adjustable resistor 1 812, and the output is connected between the fourth resistor 84 and the fifth resistor 85. The first terminal of the fourth resistor 84 is connected between the inverting input of op-amp 4 88 and adjustable resistor 1 812.

[0065] In the direct differential amplifier circuit, the op amp 48 also has a first terminal and a second terminal. The first terminal is connected between the power supply 3810 and the capacitor 1811, and the second terminal is grounded. The other end of the capacitor 1811 is grounded.

[0066] like Figure 6 As shown, in the oblique differential amplifier circuit, the operational amplifier 87 also has a first terminal and a second terminal. The first terminal is connected between the power supply 810 and the capacitor 811, and the second terminal is grounded. The other end of the capacitor 811 is grounded.

[0067] The non-inverting input of op-amp 89 is connected between the second resistor 82 and the third resistor 83, the inverting input is connected between the fifth resistor 85 and the sixth resistor 86, and the output is connected to the second terminal of the third resistor 83; the second terminal of the sixth resistor 86 is grounded.

[0068] In this circuit, resistors 81, 83, 84, and 86 are all 100KΩ, resistors 82 and 85 are both 10KΩ, and power supply 810 is 5V. In the direct differential amplifier circuit, op-amp 87 is U1C in the first LM324, op-amp 88 is U2A in the second LM324, and op-amp 89 is U2B in the second LM324. In the oblique differential amplifier circuit, op-amp 87 is U3A in the third LM324, op-amp 88 is U3C in the third LM324, and op-amp 89 is U3D in the third LM324.

[0069] The gain of the differential amplifier circuit 8 is adjusted by the adjustable resistor 812. Among the first to sixth resistors, the first resistor 81 and the fourth resistor 84 are 1% precision metal film resistors, the other four resistors are 0.1% precision metal film resistors, and the adjustable resistor 812 is a 1% precision adjustable resistor.

[0070] The final output signal gain is calculated using the following formula:

[0071] Av = R3 / R2*(1+2R1 / R0)

[0072] Where Av is the output signal gain, R3 is the third resistor 83; R2 is the second resistor 82, R1 is the first resistor 81; and R0 is the adjustable resistor 812.

[0073] The comparator circuit 9 includes an operational amplifier 91, a seventh resistor 92, an adjustable resistor 93, an eighth resistor 94, a power supply 95, a power supply 96, a power supply 97, and a capacitor 99. The seventh resistor 92 and the adjustable resistor 93 are connected in series. The first end of the seventh resistor 92 is connected to the power supply 95, and the second end of the adjustable resistor 93 is grounded. The non-inverting input of the operational amplifier 91 is connected to the output of the operational amplifier 99, and the inverting input is connected between the seventh resistor 92 and the adjustable resistor 93. One end of the eighth resistor 94 is connected to the power supply 97, and the other end is connected to the capacitor 99. The output of the operational amplifier 91 is connected between the eighth resistor 94 and the capacitor 99.

[0074] like Figure 5 As shown, in the direct comparator circuit, the operational amplifier 6 91 also has a first terminal and a second terminal. The first terminal is connected to the power supply 5 96, and the second terminal is grounded. The first terminal of the capacitor 2 98 is connected between the power supply 6 97 and the eighth resistor 94, and the second terminal of the capacitor 2 98 is grounded.

[0075] In the direct comparator circuit, op-amp six is ​​U4A from LM393, and op-amp six in the skew comparator circuit is U4B from LM393. The seventh resistor is 20K, the eighth resistor is 10K, and power supplies four (95), five (96), and six (97) are all 5V.

[0076] In this circuit, the first capacitor 105 in the direct transmitting tube circuit is the power supply decoupling capacitor for the first LM324 op-amp; the first capacitor 811 in the direct differential amplifier circuit is the power supply decoupling capacitor for the second LM324 op-amp; the first capacitor 811 in the oblique differential amplifier circuit is the power supply decoupling capacitor for the third LM324 op-amp; the second capacitor 98 in the direct comparator circuit is the power supply decoupling capacitor for the LM393 comparator; and the third capacitor 99 in both the direct comparator circuit and the oblique comparator circuit are output decoupling capacitors for the LM393 comparator.

[0077] After receiving the infrared light and ambient light from the transmitting tube 2, the receiving tube 3 converts the infrared light and ambient light into a first signal. After receiving the ambient light, the compensation tube 4 converts the ambient light into a second signal. The first and second signals are processed by the differential amplifier circuit after passing through the first operational amplifier 62 and the second operational amplifier 72, respectively. The signals from the first operational amplifier 62 and the second operational amplifier 72 are used for lossless signal transmission. The first and second signals are amplified by subtraction after passing through the differential amplifier circuit 8, and a third signal is output. The third signal enters the comparison circuit and is compared with the threshold signal. When the receiving tube 3 normally receives the infrared signal from the transmitting tube 2, it outputs a high level. When there is a measured line body blocking the distance between the receiving tube 3 and the transmitting tube 2, it outputs a low level.

[0078] The threshold signal is the threshold voltage across adjustable resistor 93. The threshold voltage is calculated using the following formula: R10 / (R7+R10)*5V, where R10 is adjustable resistor 93; R7 is the seventh resistor, and the threshold voltage adjustment range is 0~3.57V. The eighth resistor 94 is the pull-up resistor for the open-collector (OC) gate output in the LM393 comparator circuit, ensuring normal logic signal output. When the comparator circuit input voltage is higher than the set threshold voltage, the output is high (logic 1); otherwise, the output is low (logic 0).

[0079] Example 2

[0080] This embodiment provides a measurement method, which is performed using the measurement device provided in Embodiment 1, and specifically includes the following steps:

[0081] First, a verification measurement is performed, which includes: the measuring device sequentially scans the first reference rod A, the line being measured, and the second reference rod B, and then returns to the starting position.

[0082] The distance between the first reference rod A and the second reference rod B is obtained, and the displacement of the measured line body relative to the first reference rod A and the second reference rod B is obtained.

[0083] Then, an initial measurement is performed, which includes: the measuring device sequentially scanning the first reference rod A and the line body under test; after scanning the line body under test, the measuring device stops at position L on the side of the line body under test away from the first reference rod A; the distance data between position L and the line body under test is recorded and stored, the measuring device is locked, and the measuring device stops at position L, waiting for the measurement to be performed.

[0084] During measurement, several rapid measurements are performed. The displacement data of the measured line body obtained from these rapid measurements are averaged to obtain the final displacement data of the measured line body. Rapid measurement includes: the measuring device moving from position L towards the measured line body, scanning the measured line body, and then returning to position L. Using position L as the new reference position reduces the travel distance of the measuring device, minimizing the time required (averaging one-tenth of the time required for calibration measurements), thus improving measurement efficiency.

[0085] The parameters of position L can be set, typically to 5mm from the line being measured. The distances from position L to the first reference rod A and the second reference rod B are then obtained. Position L serves as a new reference position to measure the displacement of the line being measured, reducing the travel distance of the measuring device. Generally, the distance between the two reference rods is 50-60mm. Therefore, compared to existing measurement methods that scan two reference rods, the measurement method provided in this embodiment improves measurement efficiency by more than 10 times.

[0086] To ensure the reliability of the measured values, the system also features an active calibration measurement setting, which allows users to configure the frequency and timing of active calibration measurements. For example, active instrument calibration can be performed daily or every few days during off-peak hours. The active calibration measurement will measure the distance between the two reference rods and the displacement of the measured line relative to the two reference lines, and will provide alarm services for any anomalies, including changes in the distance between the two reference rods or the measured line not being between the two reference rods.

[0087] After completing the active verification measurement without any abnormalities, the measuring device returns to position L to prepare for the next measurement, ensuring that the two reference rods remain unchanged and guaranteeing the reliability of the measured values.

[0088] In special circumstances, such as when the rapid measurement fails to detect the measured line body, a standard measurement will be automatically triggered. The displacement data obtained through the standard measurement will be recorded in the average displacement data of this operation. An alarm will sound after the standard measurement, and the operation will stop until personnel are available for maintenance. The measurement will then end, and the average displacement data will be calculated. The standard measurement includes: the measuring device sequentially scans the first reference rod A and the measured line body, then returns to the starting position. After maintenance is completed, before starting the next measurement operation, the above-mentioned verification measurement will be performed first, followed by an initial measurement to ensure the accuracy of the L position, before proceeding with the rapid measurement operation.

[0089] If no standard measurement is triggered during a measurement operation, the measuring device returns to position L after completing the measurement operation, waiting for the next rapid measurement operation.

[0090] The displacement data of the measured line body is obtained through standard measurement, and the data when the measured line body was not measured in the rapid measurement is added to obtain complete displacement data of the measured line body, ensuring the accuracy and completeness of the data.

[0091] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A measuring device, characterized in that The measuring device includes a measuring probe, an ambient light compensation circuit, and a controller; The measuring probe includes an aligned and spaced-apart transmitting tube and a receiving tube, with a compensation tube on the side of the receiving tube. The measuring probe moves under the action of a driving force, and the gap between the transmitting tube and the receiving tube is used to pass through the scanning object. The ambient light compensation circuit is used to convert the transmitter signal and ambient light signal received by the receiver tube into a first signal, convert the ambient light signal received by the compensation tube into a second signal, subtract the second signal from the first signal and amplify it into a third signal, and compare the third signal with a threshold signal to obtain a result signal. The controller calculates the displacement data based on the time interval between the result signals and the moving speed of the measuring probe.

2. The measuring device of claim 1, wherein, The transmitting tube includes a straight transmitting tube and an oblique transmitting tube, and the receiving tube includes a straight receiving tube and an oblique transmitting tube. The signal emitted by the straight transmitting tube is received by the straight receiving tube, and the straight transmitting tube and the straight receiving tube are aligned in the straight direction. The signal emitted by the angled transmitting tube is received by the angled receiving tube, and the angled transmitting tube and the angled receiving tube are arranged obliquely aligned. The compensation tube includes a straight compensation tube and an oblique compensation tube. The straight compensation tube is disposed on the side of the straight receiving tube, and the oblique compensation tube is disposed on the side of the oblique receiving tube.

3. The measuring device of claim 1, wherein, In the ambient light compensation circuit, a receiving tube circuit is used to convert the transmitting tube signal and the ambient light signal into a first signal, and a compensation tube circuit is used to convert the ambient light signal into a second signal. The receiving tube circuit includes a sampling resistor and a voltage follower. The voltage follower is used in the first signal lossless input differential amplifier circuit. One end of the sampling resistor is grounded, and the other end is connected to the first end of the receiving tube. The second end of the receiving tube is connected to the power supply. The compensation transistor circuit includes sampling resistor two and voltage follower two. The voltage follower one is used in the second signal lossless input differential amplifier circuit. One end of sampling resistor two is grounded, and the other end is connected to the first end of the compensation transistor. The second end of the compensation transistor is connected to power supply two.

4. The measuring device of claim 1, wherein, In the ambient light compensation circuit, a differential amplifier circuit is used to subtract the second signal from the first signal and amplify it into a third signal. A comparator circuit is used to compare the third signal with a threshold signal to obtain the result signal.

5. The measuring device of claim 1, wherein, The measurement probe also includes a heating assembly, which is used to heat the environment in which the transmitting tube, receiving tube, and compensation tube are located.

6. The measuring device of claim 1, wherein, The result signal includes a high level and a low level. The high level indicates that the measuring probe has not scanned the object, and the low level indicates that the measuring probe has scanned the object.

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