Distance measurement by electronic method based on hardwired algorithm relay on propagation, reflection and subsequent reception of electromagnetic wave electronic angle measurement combined the function of. At the present time the widespread use of electronic distance measuring equipment in the practical operations of surveying has just about replaced chains and tapes for measuring precise distances. Electronic distance measurement edm is a method of determining the length between two points using electromagnetic waves. Calibration of electronic distance measurement device edm calibration with 1m length take. He could have done the opposite to measure distances, but this didnt happen, due to problems with his mechanical device. A project report on eye tracking interpretation system submitted by name seat no gavhale navlesh b120283824 gavhane devendra b120283825 kurkute siddheshwar b120283843 a project report submitted as a partial ful. The matter presented here is prepared by the author for their respective teaching assignments by referring the text books and reference books. It is excellently suited as a text for undergraduate and graduate students and an invaluable reference for practicing surveyors, geodesists and other scientists using edm as a measuring. The resulting measurement is often shown on a digital screen on the device. The faulty cable on the electronic measurement device ie. To ascertain this, edme is calibrated on government maintained baselines. A wide variety of electronic distance measurement instrument options are available to you. The device can measure distances between two direct points or remote ones may include radial or continuous distances.
During use, the light beam is emitted from the edm, reflected off a prism or target. Home products measuring device and nonelectric calibration equipment handheld nonelectric measurement device. Electronic distance measurement page 1 electronic distance measurement electronic distance measurement, aka edm, is used in eight field events. Electronic distance measuring tools laser, ultrasonic. The electronic distance meter edm is an essential surveying tool. In using an electrooptical distance measuring device. It is excellently suited as a text for undergraduate and graduate students and an invaluable reference for practicing surveyors, geodesists and other scientists.
On accuracy specifications of electronic distance meter. Use the 9 leveling screws a and c to adjust the plate level 12 so that the air bubble is exactly in the middle. Electronic distance measurement edm is a fundamental feature of modern surveying total stations. Engi 3703 surveying and geomatics topic instructor. Bosch glr825 digital laser distance measuring tool with. The national geodetic surveys ngs electronic distance measurement instrumentation edmi calibration base line cbl program, hereafter referred to as the cbl program provides support to the edmi user community in establishing accurate and conveniently located cbls for efficient, routine testing of equipment. All electronic distance measuring instrument suffer from a large number of. Electronic distance measuring edm device and data recorder an electronic distance measurer edm can be used to place objects or points in three dimensions in relation to the unit. Electronic distance measuring instrumentation calibration. Edm is also used routinely for measuring field event performances and checking the heights of the bar in the high jump and pole vault events at major track and field competitions.
About 68% of these are laser rangefinders, 9% are testing equipment, and 1% are other test instruments. Electronic distance meters inside trimbles geospatial instruments. Electronic distance measuring instruments sciencedirect. Course description the course is designed to provide a practical introduction to electronics with a focus on measurement and signals. Material presented here about electronic distance measuring equipment, electronic positioning systems, laser equipment, and global positioning systems gps equipment is general in nature and is not meant to replace the manufacturers operations handbook. Handheld nonelectric measurement device tecotec group. The waves are reflected from another device at the other end back to the transmitter. Methods for measuring distances electric distance measurement edm distances are measured electronically by determining the number of full and partial waves of transmitted electromagnetic energy that are required in traveling the distance between the edm and a prism. In most events, a tape measure is used to make the measurements, but the process of. The calibration process identifies any existing errors of the instrument so.
Total station that we had at the 2008 olympic trials got me thinking. Liquid controls lc sold their first flowmeter in 1954, fulfilling an order for aviation flowmeters from the u. Abstract electromagnetic distance measurement edm instrument. The only prerequisites are courses in differential equations, as well as electricity and magnetism. Fastmeasure products are hightech, easytouse, vehicle installed distance measuring instruments dmi. Electronic distance measurement an introduction fourth edition with 56 figures and 18 tables springer. In this method instruments are used to measure distance that rely on propagation, reflection and reception of electromagnetic waves like radio, visible light or infrared waves. But one way i like particularly is the ultrasound method. Distance measuring electronics instruments power tools.
The word measurement stems, via the middle french term mesure, from latin mensura, and the. Also, the main parts of the total station were explored and the students were. These instruments have been used in a wide variety of terrain and under all possible conditions with generally excellent results. In the electronic distancemeasuring system, the length of a linear interval is determined by the use of equipment that 1 sends out an electronic impulse of some sort, such as a radar microwave or a modulated light wave, and 2 measures the time required for the impulse to. Its precision and versatility make it an ideal tool for the construction and concrete trades.
Cro the cathode ray oscilloscope is probably the most versatile tool for deployment of electronic circuit and. Electronic distance measurement wavelength infrared. Measurement is the process or the result of determining the magnitude of a quantity, such as length or mass, relative to a unit of measurement, such as a meter or a kilogram. The theoretical part of the paper is concerned with length measuring methods, especially with electronic distance measurement. How can you make a device that measures the distance to the wall for example. A key component of an electronic distance measurement instrument is the reflector system, which bounces light signals of a known wavelength to a reflector to determine distance. Electronic distance measurement instrument types, functions, uses. Low prices, free fast shipping, knowledgeable staff, secure shopping. Electromagnetic distance measurement is one of the greatest single advances in surveying procedures ever made. About 59% of these are laser rangefinders, 1% are levels, and 1% are tape measures. This lab experiment was aimed to show the students how to use the edm electronic distance measurement machine that is used to measure distances between two points precisely and accurately. Blaze outdoor technology outdoor laser measuring device that pairs accurate, long distance up to 400 ft.
A series of measurements on a baseline can also be used to check the performance and. Since then, lc has built a reputation in the aviation industry for high quality, reliable flowmeter systems and practical innovations that enhance metering performance, increase safety, and streamline fueling data. Electronic distance measurement in general is a term used as a method for distance measurement by electronic means. The reliability and accuracy of electronic distance measurement equipment edme, like any equipment, is critical. Electronic distance measuring edm device and data recorder. Electronic tape measures emit a laser beam that is intended to strike an object at a distance. Total station, gis and remote sensing now with oreilly online learning. When these instruments were first introduced on the market, about 20 years ago, many surveyors and engineers were skeptical about their practical use. Electronic distance measurement electronic distance measurement edm error. The process of determining the amount, degree, or capacity by comparison direct or indirect with the accepted standards of the system units being. Electronic distance measuring method edm basic civil. This asynchronous method requires multiple measurements to obtain a range by taking multiple bearings instead of appropriate scaling of active pings, otherwise the system is just capable of providing a simple bearing from any single measurement. Contents history 1 2 physical laws and units related to edm 3 2. The strength of the magnetic field depends on the magnitude.
Electronic distance measurement electronic distance. M 122015 1 comment in distance measurement with the help of tape, the distance can be easily measured but in case of terrain ground uses of chains and tapes becomes tough. The edm emits a beam of infrared light that is modulated at a controlled rate. Ken snelgrove lect 8 sept 2607 slide 1 of 8 electronic distance measurement electronic distance measurement edm error. Bosch glr825 digital laser distance measuring tool with 825 foot range. What is the abbreviation for electronic distance measurement. Fastmeasure a precise time saving measure device is great for estimating paving jobs, building lot sizes, utility contracting, and other large distance measurement.
The prism system shown in this photograph was one of the later systems used in geodimeters. Distance measuring from dewalt, milwaukee, makita and other top tool brands. Electrical test instruments and measuring devices course no. If the primary electronic measurement system fails and we do not have a backup system, is there some. In this method instruments are used to measure distance. Figure 43 an electrooptical distance measuring instrument geodimeter. Calibration of electronic distance measurement instruments. The bosch glr825 laser measure is the longest mostaccurate outdoor laser measure on the market, measuring distances up to 825 ft. Calibration of electronic distance measurement instruments last updated august 2017 1. Electronic distance measurement free download as powerpoint presentation.
Edm abbreviation stands for electronic distance measurement. Custom electronics and a microprocessor then convert elapsed time into a distance measurement and display it on the lcd. To simplify the procedures to obtain accuracy in surveying, the electronic distance measuring method was introduced. Functional principles of electronic distance meters are introduced. The distance the moving iron vane will travel against the spring depends on the strength of the magnetic field. Use of electro optical distance measuring instruments. Laser distance measuring tools, laser tape measurers.
Here the distance is measured with the help of electromagnetic waves such as micro wave, infra red wave and other similar waves. This chapter deals with the principles and procedures of separate electronic distance measuring device edm instruments that are mountable. Electronic distance measuring instrument is a surveying. The course will integrate demonstrations and laboratory. Our experience agrees with that of other mapping and surveying organizations. A wide variety of electronic distance measurement options are available to you, such as voltage, material. Improvements to the calibration of electronic distance. Introduction an electronic distance measurement edm instrument is calibrated on a baseline to determine instrument constants and errors. Electronic distance measurement an introduction jean m. Laser signal and prismatic mirror reflecting system. A device or mechanism used to determine the present value of the quantity under measurement. The light from the laser bounces back to the device and the tool uses the time it takes for the light to return to calculate the distance that the laser traveled. Pdf calibration of electronic distance meters researchgate. Pdf the establishment of an electromagnetic distance.
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