FAQ - Borescopes
Fiberscopes use coherent image bundles (or guides) to transmit the image from the distal or working end to the user's eyepiece or CCD sensor. The more individual fibers used and their size directly reflect the resolution or clarity of the image. Fiberscopes can be either articulating, non-articulating or semi-rigid based designs.
Articulating fiberscopes use coherent image bundles (or guides) to transmit the image from the distal or working end to the user's eyepiece or CCD sensor.
These designs allow the user to control the distal end by using knobs or levers on the handle. Either 2-way or 4-way controls are available depending upon the diameters.
Articulation is commonly controlled by either a knob (4-way) or levers (2-way and some 4-way) located on the handle of the borescope.
These control the movement of the wires that run down the length of the probe ultimately moving the distal or working end. Common breakage of articulating fiberscopes is due to this control wire being snapped or pulled free. A good articulating fiberscope should allow easy ergonomic control of the knobs or levers by the user without looking.
The range of an articulating fiberscope typically means how much, or how many degrees the distal or working ends can move in any given direction. The ranges usually get smaller as the distance increases due to tension on the wires and controls. A good articulating fiberscope has a range exceeding 90-degrees in any direction.
Semi-Rigid borescopes are fiber-based instruments with a rigid sheathing surrounding the insertion probe. These products perform optically like a fiberscope but physically like a rigid borescope. These are great products to replace rigid borescopes when they are being damaged too frequently. These products require us to preset the focal distance range so the tip to target distance is needed to ensure the products perform as anticipated. Semi-rigid borescopes can also be shaped into a specific geometry to aid in navigating to an inspection area.
Semi-Rigid Tip to Target
The tip to target distance is how far the subject you are looking at is physically located from the lens of the borescope or fiberscope. Tip to target distance is required on non-articulating fiberscopes and when you are less than an inch away from your subject.
Semi-Rigid Focal Distance
Focal distance refers to the distance over which the image is in focus enough to be useable. For example, many of our semi-rigid and flexible front ends are set to a factory default of 6mm. This would allow the focal distance to be between 3 to 9mm from your target.
This means that at 6mm away from the target the image is in the best focus. As you move further away from the target (towards the 9mm distance) or closer to the target (towards the 3mm distance) the image lessens in clarity and sharpness until the image is no longer "useable".