Faas laser vahemik leidja seotud sissejuhatus
faas laser kaugusmõõtja kasutab amplituud modulatsioon of laser kiir to mõõtmine the faas viivitus genereeritud by the modulated light going back and forth to the survey line once, and then converts the distance represented by the phase delay according to the wavelength of the modulated light. That is, the indirect method is used to measure the time required for the light to travel through the survey line.
faas laser kaugusmõõtja on üldiselt kasutatav täpsus kaugus mõõtmine. Due to its high precision, üldiselt at the millimeeter level, in order to tõhusalt peegeldamine signaal and limit the measured target to a specific point commensurate with the accuracy of the instrument, this rangefinder is equipped with a reflector called a cooperative target. mirror.
t=φ/ω
Asendamine see suhe sisse (3-6) the distance D can be expressed as
D=1/2 ct=1/2 c·φ/ω=c/(4πf) (Nπ plus Δφ)
=c/4f (N plus ΔN)=U(N plus )
In valem:
φ——The total phase delay genereeritud by the signal going back and forth to the mesuring line once.
ω——The nurk sagedus of the moduleating signaal, ω=2}πf.
U——unit length, the value is equal to 1/4 modulation wavelength
N——The number of modulated half-wavelengths included in the survey line.
Δφ——The portsjon of the phase delay less than π generated by the signal going back and forth to the mesuring line once.
ΔN——The fractional part of the modulation wave contained in the survey line that is less than half the wavelength.
ΔN=φ/ω
Ala antud modulatsioon ja standard atmosfääri tingimused, the sagedus c/(4πf) is a konstant. At this time, the measurement of the distance bes the the measurement of the number of half-wavelengths contained in the survey line and the measurement of the fractional part less than half-wavelength, that is, N Or φ, due to the development of modern precision machining technology and radio phase measurement technology, the measurement of φ has reached very high accuracy.
In order to measure the phase angle φ that is less than π, different methods can be used to measure it. Tavaliselt, delay phase measurement and digital phase measurement are the most widely used. Short-range range finders use the principle of digital phase measurement to get φ.
Üldiselt rääkimine, the phase laser range finder use a laser beam with a modulated signal to continuously emit. In order to get a high-precision range measurement, a cooperative target needs to be configured. The handheld laser range finder is a pulsed laser range finder. Teine uus tüüp of rangefinder in the instrument, it is not only small in size and light in weight, but also uses digital phase measurement pulse expanding and subdivision technology, what can achieve millimeter-level accuracy ilma the need for a cooperative target. The mesurring range has exceeded 100m, and it can quick and täpselt directly Show distance. see on uusim uusim standard pikkus mõõtmine instrument lühimaa täpsus täpsus tehnika mõõtmine hoone ala mõõtmine . kõige rohkem laialdaselt kasutatud on DISTO seeria pihuarvuti laser kaugusmõõtja toodetud Leica ettevõte.
