Design and Test of a Microdestructive Tree-Ring Measurement System

Analysis of a tree ring is the primary method for determining the growth and age of a tree. In a microdestructive tree-ring measurement system, the tree under test is drilled with a microdrill at a constant rotating speed to detect the difference in density between the early and late wood, thereby realizing a microdestructive measurement of the tree-ring. The measurement system comprises a microdrill with a diameter of 3 mm, mechanical transmission, direct current (DC) servomotor, stepper motor, and control and detection circuit. The DC servomotor and stepper motor realize rotation and translation of the microdrill, respectively, through mechanical transmission. When the microdrill rotates and drills into the tree, the control and detection circuit samples and acquires the armature current of the DC servomotor, which is proportional to the resistance encountered by the drill bit and reflects the change in the density of the tree. The tree-ring number can be obtained by filtering the sampled original signals of the armature current using a finite impulse response (FIR) filtering algorithm. The annual rings of larch and fir tree discs were measured and tested using the designed system. It was observed that the average annual ring measurement accuracy of the larch discs reached 95.28%, while that of the fir discs was 84.16%. The diameter of the drill hole in the trunk was less than 3 mm after measuring the living wood, thereby achieving a microdestructive measurement of the tree-ring.

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A new automatic and interactive tree ring measurement system based on a line scan camera

The Forestry Chronicle ◽

10.5558/tfc68138-1 ◽

1992 ◽

Vol 68 (1) ◽

pp. 138-141 ◽

Cited By ~ 95

Author(s):

Régent Guay ◽

Réjean Gagnon ◽

Hubert Morin

Keyword(s):

Image Processing ◽

High Resolution ◽

Tree Ring ◽

Measurement System ◽

Analysis Techniques ◽

Image Processing And Analysis ◽

Line Scan ◽

Computerized Image Processing ◽

On Line ◽

High Resolution Images

A new automatic tree ring measurement system which uses computerized image processing and analysis techniques is presented. It is based on a line scan camera instead of a conventional TV camera so it can give high resolution images over long paths (many centimeters). On-line ring validation is possible by comparison with those on other radii. Also, the system is highly interactive so its decisions can be modified by the operator.

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Study on Plate Convex Contour Measurement System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.468-471.1993 ◽

2012 ◽

Vol 468-471 ◽

pp. 1993-1996

Author(s):

Dong Xie ◽

Feng Wang ◽

Jian Qu Zhu

Keyword(s):

Contact Force ◽

Measurement System ◽

Measurement Method ◽

Continuous Measurement ◽

Ball Screw ◽

Mechanical Transmission ◽

Servo Motor ◽

Center Of Rotation ◽

Profile Accuracy ◽

Force Compensation

This paper presents a measurement method for plate convex contour measurement by contact force. During the measured mechanical part rotation, the stylus slides forward or backward by servo motor and ball screw movement. The contact force is detected by sensors according to distance between the measured part and the stylus. The servo motor displacement has been used to calculate the radial value from the center of rotation to the tip of the stylus, and the contour points coordinates can be measured in sequence continuous measurement. By mechanical transmission gap compensation and force compensation, the better profile accuracy and effectiveness can be gotten.

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Design of Ultrasonic Distance Measurement System Based on Microcontroller

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.333-335.296 ◽

2013 ◽

Vol 333-335 ◽

pp. 296-299

Author(s):

Zhi Hong Xiao ◽

Si Yu Wu ◽

Qi Yuan An

Keyword(s):

Measurement System ◽

Distance Measurement ◽

Measurement Circuit ◽

Measuring Range ◽

Interface Circuit ◽

Serial Interface ◽

Logic Control ◽

Detection Circuit ◽

Sequential Logic ◽

Driver Circuit

The principle of an ultrasonic distance measurement system is introduced. The system adopts non-contact measurement method and it consists of signal generator, echo receiver circuit, microcontroller, time sequential logic control circuit, target distance detection circuit, temperature measurement circuit, RS-485 serial interface circuit, ultrasonic sensor and its driver circuit, etc. The results show that the system has high precision within measuring range from 20cm to 15m.

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Design of Bending Fatigue Machine for Flexible Electronics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.483 ◽

2011 ◽

Vol 383-390 ◽

pp. 483-489 ◽

Cited By ~ 1

Author(s):

Hu Wen Cao ◽

Ping Yang ◽

Bi Zhen Bao

Keyword(s):

Motor Control ◽

Fatigue Test ◽

Flexible Electronics ◽

Stepper Motor ◽

Single Chip ◽

Single Chip Microcomputer ◽

Precision Control ◽

Bending Fatigue ◽

Detection Circuit ◽

Bending Fatigue Test

According to the current requirements of bending fatigue test for flexible electronics, a bending fatigue machine based on SCM (single chip Microcomputer) has been designed. using stepper motor driving screw nut body as loading mechanism, improve the accuracy of the structure effectively by gaps eliminator, and achieve the requirement of precision control by using fraction driving technology in the motor control. Photoelectric counter and electrical signals detection circuit have also been designed to achieve unattended function. This design plays an important role in the following testing process.

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Designation of a Grating Torque Measurement Device Based on FPGA and MCU

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.422.136 ◽

2013 ◽

Vol 422 ◽

pp. 136-140

Author(s):

Hao Zhao

Keyword(s):

Measurement System ◽

Twist Angle ◽

Mechanical Transmission ◽

Torque Measurement ◽

Square Wave ◽

Wave Signal ◽

Control Optimization ◽

High Measurement ◽

Field Programmable ◽

Relationship Of

For the mechanical transmission system, the torque measurement of rotating machinery has important significance to the research and development of products test、to analysis the quality inspection safety and to the control optimization. For the complex composition of the present torque measurement, this paper puts forward a simple structure torque measurement system, and it has high measurement precision. First, the grating photoelectric output signals are converted into square wave signal, then system measurement method is accepted through the relationship of the two square wave signal phase, which has corresponding relation to the twist angle of the sensor shaft. The experimental platform is constructed based on field programmable gates array (FPGA) and MCU, the non-contact torque measurement is realized through the designation of measurement system software. This method has practical value and it is expected to be used widely.

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Measurement and Control System for Analysis of the Operation of the Stepper Motor

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.260.113 ◽

2017 ◽

Vol 260 ◽

pp. 113-126 ◽

Cited By ~ 1

Author(s):

Roland Pawliczek ◽

Piotr Soppa

Keyword(s):

Control System ◽

Measurement System ◽

Virtual Instrument ◽

Stepper Motor ◽

Measurement And Control System ◽

Extended Analysis ◽

Motor Operation ◽

And Control ◽

Measurement And Control ◽

Step Control

The paper describes a control and measurement system for controlling and analysing operation of a stepper motor. The system design is based on the concept of virtual instrument, where data acquisition and transmission use standard solutions, whereas software serves both as a generator and a measurement system – an oscilloscope. The generator allows efficient control of motor operation in the following control modes: wave, full-step and half-step control. There were no winding powering sequence errors observed. The measurement system allows presenting and analysing voltage waveforms in individual windings with possibility to detect couplings and overvoltages. It was also shown that it is possible to detect locking of rotor rotation.The proposed virtual instruments have open structure, which enables extended analysis based on available measurements or expand range of measurements as long as measurement and control system instrumentation allows that.

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Communication Module of 3D Camera Pan Tilt Zoom

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.816-817.947 ◽

2013 ◽

Vol 816-817 ◽

pp. 947-950

Author(s):

Yue Dong ◽

Zhuo Min Yang ◽

Huai Yu Xiao ◽

Yu Zhao ◽

Chun Zhi Wang ◽

...

Keyword(s):

Remote Control ◽

High Precision ◽

Control Signal ◽

Stepper Motor ◽

Level Shift ◽

Module Design ◽

Ring Number ◽

3D Camera ◽

Communication Module ◽

3D Tv

The purpose of this selected topic is for researching and designing a 3D TV high-precision camera PTZ (Pan/Tilt/Zoom) in order to have the functions of Remote double machine level shift, ticket reservation in any angle rotation.In this communication module design, NEC encoding infrared remote control decoding chip is used as a source for the remote control signal to make it possible for a photographer, within 5 meters ,to send the infrared signal to the integration of the infrared receiving head. The Infrared signals contain such information as the stepper motor direction, the rotating ring number and the working state.

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