CN211626373U - Instrument of survey trees breast height diameter - Google Patents
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- CN211626373U CN211626373U CN202020251113.XU CN202020251113U CN211626373U CN 211626373 U CN211626373 U CN 211626373U CN 202020251113 U CN202020251113 U CN 202020251113U CN 211626373 U CN211626373 U CN 211626373U
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Abstract
The utility model relates to a survey instrument of trees breast height, this survey instrument of trees breast height, including three or more than three measuring limits, a plurality of measuring limits connect gradually end to end and constitute the line type structure, hinge between the measuring limits, the measuring limit can rotate around the pin joint, can rotate between the adjacent measuring limit and constitute the contained angle of arbitrary size, one of them measuring limit is the fixed length, the other measuring limits are the extending structure, can adjust length; the utility model has simple operation and high measurement precision, and can be used in the scientific research aspects of forest resources, forest growth and the like; the utility model discloses a measure triangle-shaped or polygon in the limit constitutes the plane, the mode of calculating the internal diameter calculates trees breast diameter, compares and measures the limit and keep being located the coplanar more easily in breast diameter chi, reduces the error, improves measurement accuracy.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, concretely relates to survey instrument of trees breast height.
Background
A whole set of measuring and calculating technology and method taking trees and forest stands as main objects in forest resource survey. The main tasks are as follows: statically and dynamically analyzing accumulated resources of a forest area or a forestry bureau or a forest farm to obtain basic data for demonstrating the possibility of wood base construction and planning felling amount; providing a basis for identifying the effect of various forest management measures; providing quantity data required by forest protection and environmental protection; providing a basis for the selective breeding of forestation tree species in suitable places; fifthly, various necessary data are provided for various production plans, forestry divisions, forestry planning, and the like.
General overview the tree measurement work with history available in China is to measure the thickness of trees by using a 'arch handle' and 'surrounding' method in the spring and autumn war country. The Longquan code price table creatively compiled in Mingzhou Chongzhen year is the earliest volume table in the world. In western europe, the development of the 18 th century industry requires a relatively accurate method for measuring and calculating wood as a commodity. Some scientists in germany have worked on the measurement and calculation of the volume of fallen wood from the end of the 19 th century, established various formulas (see volume) for calculating the volume of single-plant wood, established a method for measuring the volume of standing wood by utilizing the concept of shape number, and compiled a table of the volume of wood similar to the modern one. From the beginning of the 19 th century to the 20 th century, comprehensive studies on volume, growth, harvest, and the like of standing trees and forest stands were conducted, and sampling error theories and techniques were started to be involved. By the 30 s of the 20 th century, the united states evolved from general mathematical measures, typical plot (see standard) surveys, to random sampling and statistical analysis of data. The technology for measuring trees after the 40 s is advanced suddenly, which is reflected in a reference sampling technology (forest sampling survey), a remote sensing technology (forest remote sensing) and an electronic computing technology, so that the work efficiency of sampling survey is further improved, and huge data processing work is easy to carry out. Compiling a tree number measuring table, estimating harvest, evaluating status quality and the like, and developing from single-factor simple analysis to multi-factor comprehensive analysis; new mathematical models of volume, output and growth are continuously created, growth function and harvest function research, growth simulation, establishment of forest resource database, automatic updating of resource data and the like are developed, high-precision optical tree testers are continuously generated, electronic self-recording wheel rulers are increasingly perfect, the number of tree species and data storage amount and storage time are increased, and the tree species and data can be directly input into a computer. In addition, the angle gauge tree measurement of W.Biterlich is a leap of the tree measurement technology, breaks through the tradition of a certain area survey, only uses horizontal view angle to measure surrounding trees at one point, is simple and easy, and arouses the wide interest of international tree measurement scholars. With the development of forest ecology research from qualitative description to quantitative analysis and the attention paid to whole-tree utilization and whole-forest utilization, the determination of forest biomass becomes an increasingly important tree measurement technology.
The breast diameter measurement is important basic data in the tree measurement and important basic information for forest resource investigation. The high-precision breast diameter measurement is of great significance to timely grasp the growth condition of trees and research on the growth rule of trees. The conventional breast diameter measurement is performed by a breast diameter ruler, but the accuracy is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an instrument of survey trees chest diameter in the aspect of scientific research such as easy operation, measurement accuracy height just for solving above-mentioned problem, can be used to forest resources, forest growth.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
the utility model provides a survey instrument of trees breast-height diameter, includes three or three more than measuring limit, and a plurality of measuring limit end to end connects gradually and constitutes the line type structure, and it is articulated between the measuring limit, and the measuring limit can be rotatory around the pin joint, can rotate between the adjacent measuring limit and constitute the contained angle of arbitrary size, and one of them measuring limit is the fixed length, and all the other measuring limits are extending structure, can adjust length.
As the utility model discloses a further optimization scheme, measure the limit and be hollow structure, inside constitutes one side open-ended recess, and the thickness on a plurality of measurement limit reduces in proper order, and the less measurement limit of thickness in two adjacent measurement limits is with the recess clearance fit on the great measurement limit of thickness. When the foldable measuring edge is folded, the measuring edge with smaller thickness can be folded into the measuring edge with larger thickness, so that the volume of the tool after being folded is reduced as much as possible, and the foldable measuring edge is convenient to carry.
As the utility model discloses a further optimization scheme, the both ends on measurement limit are equipped with the hinge lug that two symmetries that extend to the outside set up, and the hinge lug on adjacent measurement limit mutually supports articulatedly. The articulated lug can avoid measuring the limit that the side face rotated to measuring the limit.
As a further optimization scheme of the utility model, measure the limit and measure and articulate through the round pin axle between the limit.
As the utility model discloses a further optimization scheme, it is three to measure the limit, be first measurement limit, second measurement limit, third measurement limit respectively, and first measurement limit is articulated through the round pin axle respectively with the second measurement between limit and the third measurement limit, and first measurement limit and third measurement limit include outer chi and interior chi, and the one end and the second measurement limit of outer chi are articulated, and the other end is the free end, and inside the outer chi was located to the interior chi, be equipped with in the outer chi with interior chi clearance fit's recess, the interior chi is located in this recess.
As a further optimization scheme of the utility model, all be equipped with displacement sensor on the outer chi on first measurement limit and third measurement limit, displacement sensor is connected to the inner scale. The inner ruler slides along the groove, extends out of the free end of the outer ruler, adjusts the length of the first measuring edge or the third measuring edge, measures the displacement through the displacement sensor in the moving process of the inner ruler, and the displacement plus the length of the outer ruler is the length of the adjusted first measuring edge or the third measuring edge.
As the utility model discloses a further optimization scheme, all be equipped with angle sensor on the pin joint on first measurement limit and the pin joint on second measurement limit and third measurement limit with the pin joint on second measurement limit, the round pin axle on angle sensor's the output shaft fixed connection pin joint, the first measurement limit of round pin axle fixed connection between first measurement limit and the second measurement limit, the third is measured limit and the second and is measured the limit to round pin axle fixed connection third measurement limit between the limit, and the limit is measured to angle sensor fixed connection second. The first measuring edge and the third measuring edge drive the pin shaft to rotate when rotating, the pin shaft drives the input shaft of the angle sensor to rotate, and the angle sensor measures the rotating angles of the first measuring edge and the third measuring edge.
As a further optimization scheme of the utility model, the outer ruler of the first measuring edge is provided with a displacement sensor, and the inner ruler is connected with the displacement sensor; an angle sensor is arranged on a hinged point of the first measuring edge and the second measuring edge, an output shaft of the angle sensor is fixedly connected with a pin shaft on the hinged point, the pin shaft between the first measuring edge and the second measuring edge is fixedly connected with the first measuring edge, and the angle sensor is fixedly connected with the second measuring edge.
The beneficial effects of the utility model reside in that:
1) the utility model has simple operation and high measurement precision, and can be used in the scientific research aspects of forest resources, forest growth and the like;
2) the utility model calculates the breast diameter of the tree by the inner diameter calculation mode through the triangle or polygon in the plane formed by the measuring edge, and compared with a breast diameter ruler, the measuring edge is easier to keep on the same plane, thereby reducing the error and improving the measuring precision;
3) the utility model discloses can cooperate sensor etc. to carry out automatic measurement and calculation, can obtain measuring result fast.
Drawings
Fig. 1 is a schematic view of the structure principle of the present invention;
fig. 2 is a schematic structural diagram of the present invention in the first embodiment;
FIG. 3 is a schematic structural diagram of the present invention in the second embodiment;
fig. 4 is a schematic structural diagram of the present invention in the third embodiment.
In the figure: a measuring edge 100;
the measuring device comprises a first measuring edge 1, a second measuring edge 2, a third measuring edge 3, an outer ruler 4, an inner ruler 5, a displacement sensor 6 and an angle sensor 7.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example one
As shown in figure 1, a survey instrument of trees breast-height diameter, includes three or three more than measuring limit 100, and a plurality of measuring limit 100 connects gradually end to end and constitutes the linear structure, and it is articulated between the measuring limit 100, and measuring limit 100 can rotate around the pin joint, can rotate between the adjacent measuring limit 100 and constitute the contained angle of arbitrary size, and one of them measuring limit 100 is the fixed length, and remaining measuring limit 100 are extending structure, can adjust length.
Preferably, the measuring edge 100 is a hollow structure, a groove with an opening at one side is formed inside the measuring edge 100, the thicknesses of the measuring edges 100 are sequentially reduced, and the measuring edge 100 with the smaller thickness in the two adjacent measuring edges 100 is in clearance fit with the groove of the measuring edge 100 with the larger thickness. When the measuring edge 100 with smaller thickness is folded, the measuring edge 100 with larger thickness can be folded, so that the volume of the tool after being folded is reduced as much as possible, and the tool is convenient to carry.
Still further, the cross section of measuring limit 100 is the U-shaped, and the recess of measuring limit 100 is the rectangle recess.
Still further, two symmetrically arranged hinge lugs extending outwards are arranged at two ends of the measuring edge 100, and the hinge lugs of the adjacent measuring edges 100 are matched and hinged with each other. The hinge lug can avoid the limit of the side surface of the measuring edge 100 to the rotation of the measuring edge 100, so that the measuring edge 100 can rotate by 360 degrees.
Preferably, the measuring edge 100 is hinged to the measuring edge 100 by a pin.
Example one
As a specific example:
as shown in fig. 2, a survey instrument of trees breast height diameter, including three measuring limit 100, be first measuring limit 1 respectively, second measuring limit 2, third measuring limit 3, it is articulated through the round pin axle respectively between first measuring limit 1 and second measuring limit 2 and the third measuring limit 3, first measuring limit 1 and third measuring limit 3 include outer chi 4, interior chi 5 and displacement sensor 6, the one end and the second of outer chi 4 are measured limit 2 and are articulated, the other end is the free end, interior chi 5 is located inside outer chi 4, be equipped with the recess with interior chi 5 clearance fit in the outer chi 4, interior chi 5 is located in this recess, be equipped with displacement sensor 6 on the outer chi 4, displacement sensor 6 is connected to interior chi 5. The inner ruler 5 slides along the groove, extends out of the free end of the outer ruler 4, adjusts the length of the first measuring edge 1 or the third measuring edge 3, measures the displacement through the displacement sensor 6 in the moving process of the inner ruler 5, and the displacement plus the length of the outer ruler 4 is the adjusted length of the first measuring edge 1 or the third measuring edge 3.
Preferably, the displacement sensor 6 is a capacitive grating sensor, a movable grating of the capacitive grating sensor is arranged on a sliding block, a fixed grating is arranged on the surface of the outer ruler 4, the sliding block is in sliding connection with the outer ruler 4, and the sliding block is connected with the inner ruler 5. The slide block moves together with the inner ruler 5, so that the movable grid and the fixed grid of the capacitive grid sensor are relatively displaced, and a displacement signal is output.
Preferably, the second measuring edge 2 is provided with a host, the host comprises a circuit board, a processor, a memory, a display screen and a button cell, the processor and the memory are arranged on the circuit board, the processor is connected with the memory in a two-way mode, the signal output end of the processor is connected with the display screen, and the signal output end of the displacement sensor 6 is connected with the signal input end of the processor. The processor receives and processes the signals of the displacement sensor 6, and sends the processed signals to the display screen to display results through the display screen.
The method for measuring the breast height diameter of the tree by using the device comprises the following steps:
the first measuring edge 2 and the second measuring edge 2 are contacted with the trunk;
the two measuring edges 100 and the three measuring edges are arranged on the same horizontal plane;
thirdly, rotating the first measuring edge 1 to be tangent with the trunk;
fourthly, rotating the third measuring edge 3 to be tangent with the trunk;
fifthly, adjusting the length of the first measuring edge 1 and the length of the third measuring edge 3 to enable the free ends of the first measuring edge 1 and the third measuring edge 3 to be in contact, wherein the three measuring edges 100 form a triangle;
assuming that a hinge point of the first measuring edge 1 and the second measuring edge 2 is a point B, a hinge point of the second measuring edge 2 and the third measuring edge 3 is a point A, one end of the first measuring edge 1, which is far away from the point B, is a point C, and one end of the third measuring edge 3, which is far away from the point B, is a point D;
the second measuring edge 2 is fixed in length and has a length of c, and the adjusted lengths of the first measuring edge 1 and the third measuring edge 3 are measured and respectively obtained as a and b;
calculating the chest diameter of the trunk through a formula (1),
formula (1):
note: according to the Helen formula, the triangle area can be expressed as formula (2):
formula (2):
the radius of the triangle inscribed circle is obtained by the formula (3):
formula (3):
r＝2S/(a+b+c)；
the adjusted lengths a and b of the first measuring edge 1 and the third measuring edge 3 are measured by the following method, the lengths of the outer ruler 4 of the first measuring edge 1 and the third measuring edge 3 are both L, the displacement amounts of the inner ruler 5 are L1 and L2 respectively, and the adjusted length a of the first measuring edge 1 is L + L1; the adjusted length b of the third measuring edge 3 is L + L2.
Example two
As a specific example:
as shown in figure 3, a tool for measuring the breast diameter of a tree comprises three measuring edges 100 which are respectively a first measuring edge 1, a second measuring edge 2 and a third measuring edge 3, wherein the first measuring edge 1, the second measuring edge 2 and the third measuring edge 3 are respectively hinged through a pin shaft, the first measuring edge 1 and the third measuring edge 3 comprise an outer ruler 4, an inner ruler 5 and a displacement sensor 6, one end of the outer ruler 4 is hinged with the second measuring edge 2, the other end is a free end, the inner ruler 5 is arranged inside the outer ruler 4, a groove which is in clearance fit with the inner ruler 5 is arranged in the outer ruler 4, the inner ruler 5 is arranged in the groove, an angle sensor 7 is respectively arranged on a hinged point of the first measuring edge 1 and the second measuring edge 2 and a hinged point of the second measuring edge 2 and the third measuring edge 3, an output shaft of the angle sensor 7 is fixedly connected with a pin shaft on the hinged point, the first measuring edge 1 and the second measuring edge 2 are fixedly connected with the first measuring edge 1, the pin shaft between the third measuring edge 3 and the second measuring edge 2 is fixedly connected with the third measuring edge 3, and the angle sensor 7 is fixedly connected with the second measuring edge 2. When the first measuring edge 1 and the third measuring edge 3 rotate, the pin shaft is driven to rotate, the pin shaft drives the input shaft of the angle sensor 7 to rotate, and the angle sensor 7 measures the rotation angle of the first measuring edge 1 and the third measuring edge 3.
Preferably, the second measuring edge 2 is provided with a host, the host comprises a circuit board, a processor, a memory, a display screen and a button cell, the processor and the memory are arranged on the circuit board, the processor is connected with the memory in a two-way mode, the signal output end of the processor is connected with the display screen, and the signal output end of the angle sensor 7 is connected with the signal input end of the processor. The processor receives and processes the signals of the position angle sensor 7, and sends the processed signals to the display screen to display results through the display screen.
The method for measuring the breast height diameter of the tree by using the device comprises the following steps:
the first measuring edge 2 and the second measuring edge 2 are contacted with the trunk;
the two measuring edges 100 and the three measuring edges are arranged on the same horizontal plane;
thirdly, rotating the first measuring edge 1 to be tangent with the trunk;
fourthly, rotating the third measuring edge 3 to be tangent with the trunk;
fifthly, adjusting the length of the first measuring edge 1 and the length of the third measuring edge 3 to enable the free ends of the first measuring edge 1 and the third measuring edge 3 to be in contact, wherein the three measuring edges 100 form a triangle;
assuming that a hinge point of the first measuring edge 1 and the second measuring edge 2 is a point B, a hinge point of the second measuring edge 2 and the third measuring edge 3 is a point A, one end of the first measuring edge 1, which is far away from the point B, is a point C, and one end of the third measuring edge 3, which is far away from the point B, is a point D;
the angle A and the angle B are respectively measured by an angle sensor 7;
the breast diameter is calculated by the formula (4),
formula (4):
r＝(c^2*sinAsinB)/[2sin(A+B)]；
EXAMPLE III
As a specific example:
as shown in fig. 4, a survey instrument of trees breast height diameter, including three measuring limit 100, be first measuring limit 1 respectively, second measuring limit 2, third measuring limit 3, it is articulated through the round pin axle respectively between first measuring limit 1 and second measuring limit 2 and the third measuring limit 3, first measuring limit 1 and third measuring limit 3 include outer chi 4 and interior chi 5, the one end and the second of outer chi 4 are measured limit 2 and are articulated, the other end is the free end, interior chi 5 is located inside outer chi 4, be equipped with the recess with interior chi 5 clearance fit in the outer chi 4, interior chi 5 is located in this recess, be equipped with displacement sensor 6 on the outer chi 4 on first measuring limit 1, displacement sensor 6 is connected to interior chi 5. The inner ruler 5 slides along the groove, extends out of the free end of the outer ruler 4, adjusts the length of the first measuring edge 1, measures the displacement through the displacement sensor 6 in the moving process of the inner ruler 5, and the displacement plus the length of the outer ruler 4 is the length of the adjusted first measuring edge 1.
Be equipped with angle sensor 7 on the pin joint on first measurement limit 1 and the second measurement limit 2, the round pin axle on the output shaft fixed connection pin joint of angle sensor 7, the first measurement limit 1 of round pin axle fixed connection between first measurement limit 1 and the second measurement limit 2, angle sensor 7 fixed connection second measurement limit 2. When the first measuring edge 1 rotates, the pin shaft is driven to rotate, the pin shaft drives the input shaft of the angle sensor 7 to rotate, and the angle sensor 7 measures the size of a corner of the first measuring edge 1.
Preferably, the displacement sensor 6 is a capacitive grating sensor, a movable grating of the capacitive grating sensor is arranged on a sliding block, a fixed grating is arranged on the surface of the outer ruler 4, the sliding block is in sliding connection with the outer ruler 4, and the sliding block is connected with the inner ruler 5. The slide block moves together with the inner ruler 5, so that the movable grid and the fixed grid of the capacitive grid sensor are relatively displaced, and a displacement signal is output.
Preferably, the second measuring edge 2 is provided with a host, the host comprises a circuit board, a processor, a memory, a display screen and a button cell, the processor and the memory are arranged on the circuit board, the processor is connected with the memory in a two-way mode, the signal output end of the processor is connected with the display screen, and the signal output ends of the displacement sensor 6 and the angle sensor 7 are connected with the signal input end of the processor. The processor receives and processes the signals of the displacement sensor 6 and the angle sensor 7, and sends the processed signals to the display screen to display results through the display screen.
The method for measuring the breast height diameter of the tree by using the device comprises the following steps:
the first measuring edge 2 and the second measuring edge 2 are contacted with the trunk;
the two measuring edges 100 and the three measuring edges are arranged on the same horizontal plane;
thirdly, rotating the first measuring edge 1 to be tangent with the trunk;
fourthly, rotating the third measuring edge 3 to be tangent with the trunk;
fifthly, adjusting the length of the first measuring edge 1 and the length of the third measuring edge 3 to enable the free ends of the first measuring edge 1 and the third measuring edge 3 to be in contact, wherein the three measuring edges 100 form a triangle;
assuming that a hinge point of the first measuring edge 1 and the second measuring edge 2 is a point B, a hinge point of the second measuring edge 2 and the third measuring edge 3 is a point A, one end of the first measuring edge 1, which is far away from the point B, is a point C, and one end of the third measuring edge 3, which is far away from the point B, is a point D;
the second measuring edge 2 is fixed in length and has a length of c, and the adjusted length a of the first measuring edge 1 is obtained through measurement.
The chest diameter is calculated by formula (5), and at the same time, the chest diameter reading is displayed on the display and stored.
Formula (5):
r＝2*a*c*sinB/(a+c+b)；
wherein b is derived from formula (6);
formula (6):
b＝[(a-c*coxB)2+(c*sinB)2]1/2。
the above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (8)
1. A survey instrument of trees breast height diameter which characterized in that: including three or three more than measuring the limit, a plurality of measures the limit and connects gradually end to end and constitutes the line type structure, measures and articulates between the limit, measures the limit and can rotate around the pin joint, can rotate between the adjacent measurement limit and constitute the contained angle of arbitrary size, and one of them measurement limit is the fixed length, and all the other measurement limits are extending structure, can adjust length.
2. The tool of claim 1, wherein said means for determining the breast diameter of a tree comprises: the measuring edge is of a hollow structure, a groove with an opening at one side is formed inside the measuring edge, the thickness of the measuring edges of the plurality of measuring edges is reduced in sequence, and the measuring edges with smaller thickness in the two adjacent measuring edges are in clearance fit with the groove of the measuring edge with larger thickness.
3. The tool of claim 1, wherein said means for determining the breast diameter of a tree comprises: the both ends on measurement limit are equipped with the hinge ear of two symmetry settings that extend to the outside, and the hinge ear on adjacent measurement limit is mutually supported articulatedly.
4. The tool of claim 1, wherein said means for determining the breast diameter of a tree comprises: the measuring edge is hinged with the measuring edge through a pin shaft.
5. The tool of claim 1, wherein said means for determining the breast diameter of a tree comprises: the measuring edge is three, and is first measuring edge, second measuring edge, third measuring edge respectively, and first measuring edge is articulated through the round pin axle respectively between second measuring edge and the third measuring edge, and first measuring edge and third measuring edge include outer chi and interior chi, and the one end and the second measuring edge of outer chi are articulated, and the other end is the free end, and inside the outer chi was located to the interior chi, be equipped with in the outer chi with interior chi clearance fit's recess, the interior chi is located in this recess.
6. The tool of claim 5, wherein said means for determining the breast diameter of said tree comprises: and displacement sensors are arranged on the outer ruler of the first measuring edge and the outer ruler of the third measuring edge, and the inner ruler is connected with the displacement sensors.
7. The tool of claim 5, wherein said means for determining the breast diameter of said tree comprises: the hinge joint of the first measuring edge and the second measuring edge and the hinge joint of the second measuring edge and the third measuring edge are both provided with an angle sensor, an output shaft of the angle sensor is fixedly connected with a hinge pin on the hinge joint, the hinge pin between the first measuring edge and the second measuring edge is fixedly connected with the first measuring edge, the hinge pin between the third measuring edge and the second measuring edge is fixedly connected with the third measuring edge, and the angle sensor is fixedly connected with the second measuring edge.
8. The tool of claim 5, wherein said means for determining the breast diameter of said tree comprises: the outer ruler of the first measuring edge is provided with a displacement sensor, and the inner ruler is connected with the displacement sensor; an angle sensor is arranged on a hinged point of the first measuring edge and the second measuring edge, an output shaft of the angle sensor is fixedly connected with a pin shaft on the hinged point, the pin shaft between the first measuring edge and the second measuring edge is fixedly connected with the first measuring edge, and the angle sensor is fixedly connected with the second measuring edge.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113959300A (en) * | 2021-05-31 | 2022-01-21 | 河南省林业科学研究院 | Intelligent triangular caliper trunk diameter measuring device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113959300A (en) * | 2021-05-31 | 2022-01-21 | 河南省林业科学研究院 | Intelligent triangular caliper trunk diameter measuring device and method |
| CN113959300B (en) * | 2021-05-31 | 2023-09-12 | 河南省林业科学研究院 | Trunk diameter measuring device and method for intelligent triangular caliper |
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