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. Home products measuring device and nonelectric calibration equipment handheld nonelectric measurement device. The theoretical part of the paper is concerned with length measuring methods, especially with electronic distance measurement. The electronic distance meter edm is an essential surveying tool.
Fastmeasure products are hightech, easytouse, vehicle installed distance measuring instruments dmi. Use the 9 leveling screws a and c to adjust the plate level 12 so that the air bubble is exactly in the middle. The reliability and accuracy of electronic distance measurement equipment edme, like any equipment, is critical. He could have done the opposite to measure distances, but this didnt happen, due to problems with his mechanical device. Blaze outdoor technology outdoor laser measuring device that pairs accurate, long distance up to 400 ft. 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. A device or mechanism used to determine the present value of the quantity under measurement. The bosch glr825 laser measure is the longest mostaccurate outdoor laser measure on the market, measuring distances up to 825 ft. Cro the cathode ray oscilloscope is probably the most versatile tool for deployment of electronic circuit and.
Bosch glr825 digital laser distance measuring tool with. About 68% of these are laser rangefinders, 9% are testing equipment, and 1% are other test instruments. The resulting measurement is often shown on a digital screen on the device. How can you make a device that measures the distance to the wall for example. 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. Here the distance is measured with the help of electromagnetic waves such as micro wave, infra red wave and other similar waves. Laser signal and prismatic mirror reflecting system. The edm emits a beam of infrared light that is modulated at a controlled rate. Low prices, free fast shipping, knowledgeable staff, secure shopping. During use, the light beam is emitted from the edm, reflected off a prism or target. The distance the moving iron vane will travel against the spring depends on the strength of the magnetic field.
This chapter deals with the principles and procedures of separate electronic distance measuring device edm instruments that are mountable. Total station that we had at the 2008 olympic trials got me thinking. Use of electro optical distance measuring instruments. Electronic distance measurement electronic distance. Total station, gis and remote sensing now with oreilly online learning.
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. Liquid controls lc sold their first flowmeter in 1954, fulfilling an order for aviation flowmeters from the u. If the primary electronic measurement system fails and we do not have a backup system, is there some. 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. The faulty cable on the electronic measurement device ie. What is the abbreviation for electronic distance measurement.
Its precision and versatility make it an ideal tool for the construction and concrete trades. Electronic distance measurement edm is a fundamental feature of modern surveying total stations. In the last email i wrote about how easy it was to measure temperature. 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. Fastmeasure a precise time saving measure device is great for estimating paving jobs, building lot sizes, utility contracting, and other large distance measurement. To simplify the procedures to obtain accuracy in surveying, the electronic distance measuring method was introduced.
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 measurement wavelength infrared. Distance measuring electronics instruments power tools. 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. Abstract electromagnetic distance measurement edm instrument. Functional principles of electronic distance meters are introduced. On accuracy specifications of electronic distance meter. Contents history 1 2 physical laws and units related to edm 3 2. Introduction an electronic distance measurement edm instrument is calibrated on a baseline to determine instrument constants and errors. 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. Custom electronics and a microprocessor then convert elapsed time into a distance measurement and display it on the lcd. The prism system shown in this photograph was one of the later systems used in geodimeters. Also, the main parts of the total station were explored and the students were. Bosch glr825 digital laser distance measuring tool with 825 foot range. The device can measure distances between two direct points or remote ones may include radial or continuous distances.
Electronic distance meters inside trimbles geospatial instruments. When these instruments were first introduced on the market, about 20 years ago, many surveyors and engineers were skeptical about their practical use. Electromagnetic distance measurement is one of the greatest single advances in surveying procedures ever made. But one way i like particularly is the ultrasound method. The calibration process identifies any existing errors of the instrument so. Ken snelgrove lect 8 sept 2607 slide 1 of 8 electronic distance measurement electronic distance measurement edm error. Electronic distance measuring method edm basic civil. Course description the course is designed to provide a practical introduction to electronics with a focus on measurement and signals. Handheld nonelectric measurement device tecotec group. A series of measurements on a baseline can also be used to check the performance and.
Electronic distance measuring edm device and data recorder. In using an electrooptical distance measuring device. A wide variety of electronic distance measurement options are available to you, such as voltage, material. Electronic distance measurement edm is a method of determining the length between two points using electromagnetic waves. Calibration of electronic distance measurement instruments. Electronic distance measuring instrumentation calibration. Electronic distance measuring edm instruments introduction edm are now the prime measuring device for land surveyors and others. The only prerequisites are courses in differential equations, as well as electricity and magnetism.
Electronic distance measurement page 1 electronic distance measurement electronic distance measurement, aka edm, is used in eight field events. 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. Calibration of electronic distance measurement instruments last updated august 2017 1. The word measurement stems, via the middle french term mesure, from latin mensura, and the. 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. In most events, a tape measure is used to make the measurements, but the process of. To ascertain this, edme is calibrated on government maintained baselines. 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. Edm abbreviation stands for electronic distance measurement. 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.
In this method instruments are used to measure distance. Distance measuring from dewalt, milwaukee, makita and other top tool brands. The matter presented here is prepared by the author for their respective teaching assignments by referring the text books and reference books. Electronic distance measuring instruments sciencedirect. Electronic distance measurement an introduction jean m. The strength of the magnetic field depends on the magnitude. Improvements to the calibration of electronic distance. Electronic distance measuring instrument is a surveying. Electronic distance measuring tools laser, ultrasonic. 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.
The process of determining the amount, degree, or capacity by comparison direct or indirect with the accepted standards of the system units being. All electronic distance measuring instrument suffer from a large number of. Our experience agrees with that of other mapping and surveying organizations. Electrical test instruments and measuring devices course no. The course will integrate demonstrations and laboratory. A wide variety of electronic distance measurement instrument options are available to you. 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. 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.
About 59% of these are laser rangefinders, 1% are levels, and 1% are tape measures. Electronic distance measurement electronic distance measurement edm error. These instruments have been used in a wide variety of terrain and under all possible conditions with generally excellent results. Calibration of electronic distance measurement device edm calibration with 1m length take. It is excellently suited as a text for undergraduate and graduate students and an invaluable reference for practicing surveyors, geodesists and other scientists. Pdf the establishment of an electromagnetic distance. Pdf calibration of electronic distance meters researchgate. Electronic distance measurement free download as powerpoint presentation. 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 waves are reflected from another device at the other end back to the transmitter. Electronic distance measurement in general is a term used as a method for distance measurement by electronic means. Figure 43 an electrooptical distance measuring instrument geodimeter.
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