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Where D is the full display image dimensions (either horizontal or vertical), and d is the target dimensions (either horizontal or vertical).

Checking is very common in post and beam construction. The material is going through it’s normal routine and you have to live with it. In my mind it adds to the character of the building. Larry

Checking is the correct term, and checking is characteristic of Douglas Fir. It is a sinewy wood, and that’s what gives it its strength over most other woods. I love to see post and beam construction with large checks in it. On the name subject, you’ll often see Doug fir headers that came out of the center of the tree twist around their own centers. Nothing will stop them. I saw one lift several stories as it turned.

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I think those can be considered part of the design spec. Just like 2x4 walls are designed to have x amount of holes drilled without affecting the purpose.

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Sensor size is determined by both the size of the pixels and number of pixels on the sensor. This can be optimized for each application, with larger sensors optimal for sensitivity limited applications, and smaller sensors optimal for resolution limited applications.

Field of view defines the maximum area of a sample that a camera can image, determined by the focal length of the lens and the sensor size.

The focal length of a lens converges light so that the image of an object is focused onto the sensor. This determines the angular field of view, a parameter of the overall field of view. This is defined as the angle between any light captured at the horizontal and any light captured at the edge of the of the object. All of these parameters play a role in determining the FOV of a camera and can be measured using either trigonometry and the angular field of view, or via an optical test, in which a black body is utilized to create a virtual image

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The sensor size is determined by both the number of pixels on the sensor, and the size of the pixels. Different sized pixels are used for different applications, with larger pixels used for higher sensitivity, and smaller pixels used for higher spatial resolution (find out more on Pixel Size and Camera Resolution).

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I think those can be considered part of the design spec. Just like 2x4 walls are designed to have x amount of holes drilled without affecting the purpose.

Have only done a few post and beam inspections. This morning’s had cracks or splits in many members from drying out. Some where approximately 3/8 to 1/2 inch wide and go through 1/2 the width of the timber. Is this excessive? Is there anything else I should be looking for?

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The focal length of the lens describes the distance between the lens and the focused image on the sensor. As light passes through the lens it will either converge (positive focal length) or diverge (negative focal length), however within cameras the focal length is predominately positive. Shorter focal lengths converge the light more strongly (i.e. at a sharper angle) to focus the subject being imaged. Longer focal lengths, in comparison, converge the light less strongly (i.e. at a shallower angle) in order to focus the image.

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Field of view (FOV) is the maximum area of a sample that a camera can image. It is related to two things, the focal length of the lens and the sensor size. Figure 1 shows a comparison between the field of view and the size of the sensor. Assuming that the focal length of the lens is the same, the larger the sensor the larger the field of view.

Is there a maximum size for checking? I had some checking that was around an inch today. It just looked larger than what I have seen in the past but I have only done a handful of post and beam inspections.

The gain relates the number of photoelectrons released to the gray levels displayed, and can be used to enhance contrast for low-light imaging.

There are many subcategories of UV light, each which need different sensor requirements. These include both physical and chemical sensor changes.

Bolts are commonly used to limit the size and effects of the cracking, which would probably be part of the design requirements in the seismic zone that I call home.

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This allows the FOV dimensions (i.e. vertical and horizontal distances) to be measured without knowing lens focal length or sensor size. The image created, including the target, is then displayed on a monitor, with the target image being a subset of the full image display. This allows the FOV to be approximated as:

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This means that the distance of the focal length is determined by how strongly the light is converged by the lens in order to focus the subject being imaged. This, in turn, influences the angle from the horizonal of light that can be captured by the lens. This is known as the angular field of view (AFOV) and is required to determine the overall FOV. The AFOV is the angle between any light captured at the horizonal, and any light captured at the edge (as shown in Figure 2). If you have a fixed sensor size, altering the focal length will alter the AFOV and therefore the overall FOV. A shorter focal length provides a larger AFOV view, and therefore a larger FOV. The same is true but vice versa for longer focal lengths, as indicated in Figure 2.

To measure the FOV of UV, visible and infrared cameras, optical tests are commonly used. During the test, light is focused from a black body (an object that absorbs all light that falls on it) onto a test target at the focal place. By using a set of mirrors, a virtual image can be created that is at an infinitely far distance.

Figure 3 shows a simplified version of how these assumptions allow for AFOV calculation. By using trigonometry, the AFOV can be expressed as:

There are two processes which can be used to enhance UV sensitivity for wavelengths >200 nm: UV photon conversion, and anti-reflection coatings.

Agree with above. Generally checking does not affect the strength of the timber frame structure. You will find the same thing in log homes.

Thanks for the replies, I got a hold of a local timber framer this morning and that was his response, that the checking, as he called it, was normal when the timbers used had the heart of the tree at or near the center of the timber.