Start with a block plane. You can use a block plane to trim just about anything: easing sharp edges, flush-trimming dovetails or wood plugs, or chamfering elements, as shown at right, quicker than it takes to set up a router. It fits snugly into your hand for comfortable, intuitive use. Standard block planes feature a cutting angle of 45°.
A laser distance meter emits a pulse of laser at a target. The pulse then reflects off the target and back to the sending device (in this case, a laser distance meter). This 'time of flight' principle is based on the fact that laser at a fairly constant speed through the Earth’s atmosphere.
Inside the meter, a simple computer quickly calculates the distance to target. This method of distance calculation is capable of measuring the distance from the Earth to the moon within a few centimeters. Laser distance meters may also be referred to as “range finders” or “laser range finders.” Calculating Distance. Lasers are focused, intense beams of light, usually of a single frequency. They are very useful for measuring distances because they travel at fairly constant rates through the atmosphere and travel much longer distances before divergence (the weakening and spreading out of a beam of light) reduces the efficacy of the meter.
Laser light is also less likely to disperse like white light, which means that laser light can travel a much greater distance without losing intensity. Compared with ordinary white light, a laser pulse retains much of its original intensity when reflected off the target, which is very important when calculating distance to an object. The accuracy of a laser distance meter depends on the original pulse returning to the sending device. Even though laser beams are very narrow and have high energies, they are subject to the same atmospheric distortions that affect normal, white light. These atmospheric distortions may make it difficult to get an accurate reading of the distance of an object near greenery or over long distances of more than 1 kilometer in desert terrain. Also, different materials reflect light to greater or lesser degrees. A material that tends to absorb or scatter light (diffusion) reduces the likelihood the original laser pulse can be reflected back for calculation.
In cases where the target has diffuse reflection, a laser distance meter using a “phase shift method” should be used. Receiving Optics.
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To ensure reliability, laser distance meters employ some method to minimize background light. Too much background light can interfere with the measurement when the sensor mistakes some part of the background light for the reflected laser pulse, resulting in a false distance reading. For example, a laser distance meter designed for use in Antarctic conditions, where intense background light is expected, employs a combination of narrow bandwidth filters, split beam frequencies, and a very small iris to block out as much interference from background light as possible.