激光(guāng)測距儀顧名思義就是測量距離的(de)儀器，手持式防爆激光(guāng)測距儀用(yòng)于煤礦井下(xià)，對(duì)巷道、工作面、采掘面等距離、高(gāo)度的(de)準确及快(kuài)速測量，并可(kě)計算(suàn)面積、體積等。也(yě)可(kě)以用(yòng)于安監執法領域，對(duì)執法現場(chǎng)的(de)準确及快(kuài)速測量，并可(kě)計算(suàn)面積、體積等。可(kě)廣泛應用(yòng)于工業、商業的(de)裝修、工程建設等領域。具體可(kě)用(yòng)于地闆瓷磚鋪設；牆體塗料面積估算(suàn)；工地施工距離/面積/體積測量等。相對(duì)于望遠(yuǎn)鏡型式激光(guāng)測距儀，具有精度高(gāo)（望遠(yuǎn)鏡型式激光(guāng)測距儀精度爲1米），顯示屏幕大(dà)的(de)優點。
從測距基本原理(lǐ)，可(kě)以分(fēn)爲激光(guāng)測距儀、超聲波測距儀和(hé)紅外測距儀三類。激光(guāng)測距儀式目前使用(yòng)比較廣泛的(de)測距儀，式利用(yòng)激光(guāng)對(duì)目标的(de)距離進行準确測定的(de)儀器。激光(guāng)測距儀在工作時(shí)向目标射出一束很細的(de)激光(guāng)，由光(guāng)電元件接收目标反射的(de)激光(guāng)束，計時(shí)器測定激光(guāng)束從發射到接收的(de)時(shí)間，計算(suàn)出從觀測者到目标的(de)距離。
手持式激光(guāng)測距儀的(de)常見問題：
1. 利用(yòng)激光(guāng)測距的(de)原理(lǐ)是什(shén)麽？
測距原理(lǐ)基本可(kě)以歸結爲測量光(guāng)往返目标所需要時(shí)間，然後通(tōng)過光(guāng)速c =299792458m/s 和(hé)大(dà)氣折射系數n 計算(suàn)出距離D。由于直接測量時(shí)間比較困難，通(tōng)常是測定連續波的(de)相位，稱爲測相式測距儀。
2.被測物(wù)體平面須與光(guāng)線垂直麽？
通(tōng)常精密測距需要全反射棱鏡配合，而房(fáng)屋量測用(yòng)的(de)測距儀，直接以光(guāng)滑的(de)牆面反射測量，主要是因爲距離比較近，光(guāng)反射回來(lái)的(de)信号強度夠大(dà)。與此可(kě)以知道，要垂直，否則返回信号過于微弱将無法得(de)到準确距離。
3.若被測物(wù)體平面爲漫反射是否可(kě)以？
通(tōng)常也(yě)是可(kě)以的(de)，實際工程中會采用(yòng)薄塑料闆作爲反射面以解決漫反射嚴重的(de)問題。
A customer asked: coal mine need to purchase a number of explosion-proof laser rangefinder, whether there is a handheld, portable laser rangefinder. So what's the use of portable laser rangefinder? I believe many people don't know. I'll give you a stroke.
As the name implies, the laser rangefinder is a distance measuring instrument. The handheld explosion-proof laser rangefinder is used in underground coal mines to accurately and rapidly measure the distance and height of roadway, working face and mining face, and can calculate the area and volume. It can also be used in the field of safety supervision and law enforcement to accurately and quickly measure the law enforcement scene, and calculate the area and volume. It can be widely used in industrial, commercial decoration, engineering construction and other fields. It can be used for floor tile laying, wall coating area estimation, site construction distance / area / volume measurement, etc. Compared with the telescope laser rangefinder, it has the advantages of high precision (the precision of telescope laser rangefinder is 1 meter) and the display screen is large.
From the basic principle of ranging, it can be divided into three categories: laser rangefinder, ultrasonic rangefinder and infrared rangefinder. Laser ranging ceremony is currently widely used in rangefinder, which uses laser to accurately measure the distance of the target. The distance from the receiving laser beam to the target is measured by the time from the receiving laser beam to the target.
Common problems of handheld laser rangefinder:
1. What is the principle of laser ranging?
The principle of ranging can be summed up as measuring the time required for light to and from the target, and then the distance D can be calculated by the light speed c = 299792458m / s and atmospheric refraction coefficient n. Because it is difficult to measure time directly, it is usually to measure the phase of continuous wave.
2. Must the plane of the measured object be perpendicular to the light?
In general, precise ranging requires the cooperation of total reflection prism, while the rangefinder used for house measurement directly uses smooth wall reflection measurement, mainly because the distance is relatively close, and the signal intensity reflected by light is large enough. With this we can know, to vertical, otherwise the return signal is too weak will not be able to get the accurate distance.
3. If the plane of the measured object is diffuse reflection, is it OK?
Generally, it is also possible to use thin plastic plate as reflection surface to solve the serious problem of diffuse reflection.