Light illuminationcalculation

In other words, it is a measuring device that allows us to know how much light or luminosity there is in an environment with which light is perceived by the human eye.

For this reason, it is very important to be able to measure the light levels correctly according to the use that our space will have in order to have a correct illumination. From Faro Barcelona we want to give you some tips so that you can measure light correctly and be efficient in the expected result.

Light illuminationlevel

Before we look at how light is measured, let's look at a little more definition of this concept. Light is a form of electromagnetic radiation capable of exciting the retina of the human eye to produce a visual sensation.

The human eye is sensitive to a very wide range of light intensities, but at low levels of illumination, it can lose the ability to differentiate some details.

At each end of the visible spectrum - and already imperceptible to the human eye - are the wavelengths corresponding to infrared light - 750 nm - and ultraviolet light - below 400 nm.

The pixel pitch is quite simply the width of a pixel on the sensor, typically measured in microns (μm). This makes things simpler for calculating the overall physical sensor size, simply multiply the resolution by the pixel pitch. Unfortunately it creates confusion when it comes to how those thermal or SWIR sensor sizes affect the field of view and detail levels of the camera.

Light illuminationtest

Infiniti accounts for these differences by measuring the camera’s effective detail using PPM. We also use an internally developed tool that can preview the field of view for most sensor sizes at any focal length. Please contact us today for help with selecting the best camera for your application and budget.

The luxmeter is a tool that helps to measure the lighting conditions of an interior space. As its name indicates, the luxmeter's unit of measurement is the lux.

First let’s get the well-known 35mm format out of the way. The exact dimension of a “35mm sensor” measures 36×24mm, which doesn’t seem to have any logical relation. That’s because the name is in reference to 35mm film, which was the most common film size before digital cameras came around. It was named because it was 35mm in width, however the sprockets and information that needed to be included on the film resulted in an image size that was roughly 36×24mm. Obviously, digital sensors don’t need the sprockets and frame information, but the name stuck so that DSLR manufacturers could market their cameras as having the same size sensor as their traditional film cameras. (Thus you could use the same lenses and expect the same field-of-view.)

Illumination lightcar

With standard visible sensors, increasing the resolution without changing the sensor size increases the amount of detail in the image, however with thermal cameras increasing the resolution while maintaining the pixel pitch gives the same amount of detail on an image but with a wider field of view.

Let’s face it, digital camera sensors are measured in ridiculous ways. If you’re trying to make sense of what dimension a 1/2.8" sensor size is referring to, or if you’re wondering how thermal imaging sensor measurements are different, you’ve come to the right place.

Illuminationlighting design

As more smaller digital sensors needed more differentiation, decimals were added for the measurements between 1/3" and 1/2", and between 1/2" and 1". We now have sensors categorized into various measurements involving fractions with decimals (1/1.9", 1/2.8", etc.), but all are still rough approximations of what the diagonal tube size might be. To make matters even worse, the practice of measuring sensors based on their diagonal measurement means that sensors with a widescreen aspect ratio fall into a different size category than a sensor that's the same width but in a 4:3 aspect ratio. Meaning a smaller widescreen sensor can offer a wider field of view than a larger “fullscreen” sensor.

Radiation energy in the form of waves is only perceptible when it interacts on a medium with a given direction. This transfer of energy from one body to another is what we call radiation.

Illuminationlighting meaning

Through the sensor inside the lux meter we can obtain, at a selected point, the value of the light intensity. In this way we can know if the light, artificial or natural, captured by the meter meets or does not meet the minimum values for its conversion to be adequate.

Visible light or the visible spectrum is the region of the electromagnetic spectrum that can be perceived by the human eye and corresponds to wavelengths between 380 and 750 nanometres.

LEDilluminationlights

The operation is very simple, but before measuring the light it is advisable to take into account the preconditions. Thus, the distance and the angle between the luxmeter and the object to be measured should be fixed in order to obtain results with high reproducibility.

Light is the form of energy that illuminates things and makes them visible. It is an electromagnetic wave that can be perceived by the human eye and whose frequency determines its colour.

When smaller digital sensors were developed, they decided to measure them based on what the tube size would be if it were a 1950s video camera. As a result, camera sensors that measure themselves this way (1", 1/3", 1/2.8", etc.) typically have a diagonal measurement roughly two thirds of that diameter. However, to make matters even worse, manufacturers often wanted the sensor size to be a simpler fraction, so instead of being a more exact 9/16" or 27/32" for example, measurements were often rounded up or down to the nearest simpler fraction. This means it’s possible to have multiple digital sensors that are all classified as 1/3" sensors but with different actual dimensions.

Typesof illuminationpdf

Luxmeters can have different scales depending on the amount of light to be measured, in order to be able to have a more exact precision in case of stronger or weaker luminosity.

Other digital camera sensors get their size names and numbers from a much more bizarre history. When video cameras were invented back in the 1950s, they used vacuum tubes to capture the image, much like televisions of the day used vacuum tubes to display the image. These sensors were measured by the outside diameter of the tube, which typically produced a usable image about 2/3 of that size.

If you dig deep into the technical specifications of a digital image sensor, you’ll eventually find a measurement for the “pixel pitch” of the sensor. The pixel pitch is a more precise and straightforward measurement that unfortunately isn’t mentioned often in standard camera specifications. Thermal imaging sensors on the other hand (MWIR and LWIR), as well as SWIR sensors, are all measured by their pixel pitch.

In order to measure light, according to the International System of Measurement, we have to base ourselves on three specific aspects and on the distance of the set of luminous rays from the same origin.

In 1672, the scientist Isaac Newton demonstrated that sunlight, white light, was not pure as previously believed, but was composed of a mixture of different colours. He refracted white light through a prism and broke it down into the basic colours of the visible spectrum.

White light is therefore understood as light that contains all the colours of the visible spectrum, which can be classified as follows: