有客户问：煤矿需要采购一批防爆激光测距仪，有没有手持式的，携带比较方便的激光测距仪。那么手持式方便激光测距仪有什么用处呢，相信很多人都不知道，小编就给大家捋一捋。
激光测距仪顾名思义就是测量距离的仪器，手持式防爆激光测距仪用于煤矿井下，对巷道、工作面、采掘面等距离、高度的准确及快速测量，并可计算面积、体积等。也可以用于安监执法领域，对执法现场的准确及快速测量，并可计算面积、体积等。可广泛应用于工业、商业的装修、工程建设等领域。具体可用于地板瓷砖铺设；墙体涂料面积估算；工地施工距离/面积/体积测量等。相对于望远镜型式激光测距仪，具有精度高（望远镜型式激光测距仪精度为1米），显示屏幕大的优点。从测距基本原理，可以分为激光测距仪、超声波测距仪和红外测距仪三类。激光测距仪式目前使用比较广泛的测距仪，式利用激光对目标的距离进行准确测定的仪器。激光测距仪在工作时向目标射出一束很细的激光，由光电元件接收目标反射的激光束，计时器测定激光束从发射到接收的时间，计算出从观测者到目标的距离。手持式激光测距仪的常见问题：
1. 利用激光测距的原理是什么？测距原理基本可以归结为测量光往返目标所需要时间，然后通过光速c =299792458m/s 和大气折射系数n 计算出距离D。由于直接测量时间比较困难，通常是测定连续波的相位，称为测相式测距仪。2.被测物体平面须与光线垂直么？通常精密测距需要全反射棱镜配合，而房屋量测用的测距仪，直接以光滑的墙面反射测量，主要是因为距离比较近，光反射回来的信号强度够大。与此可以知道，要垂直，否则返回信号过于微弱将无法得到准确距离。3.若被测物体平面为漫反射是否可以？通常也是可以的，实际工程中会采用薄塑料板作为反射面以解决漫反射严重的问题。
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.