What is goniophotometry meaning?

Goniophotometers are devices that may be used to measure the characteristics of light produced by a light source, such as color, intensity, and wavelength. This provides information on the uniformity of the emitted light, the direction of the emitted light, and the characteristics of light at various angles and long distances. That’s why the method that involves goniophotometers is called goniophotometry.

Goniophotometry measurement
In goniophotometry, however, fast photometers are used, reducing measurement time. Goniophotometry is quicker than goniospectroscopy but only measures photometric quantities.

In most instances, the application dictates the detector type. However, most users value saving precious measurement time in their regular laboratory practise. A photometer, for example, may substantially decrease the total measurement time in goniospectroradiometric systems. An estimate of the measurement duration is therefore useful information in this decision-making process.

The measurement duration depends on several variables, such as spatial radiation characteristics (and therefore resolution), number of conducted C-planes, applied standard rules, goniometer type, and sample size. This study compares two popular SSL-sources. As a result, the two specimens have different spatial radiation properties and are monitored using distinct detectors. With this data, one may estimate the average measurement time, the related mistakes, and provide some guidelines for the user when it comes to measuring times.

Estimation of goniophotometric measuring times
In contrast to the findings of the goniophotometric measurements, the results of the photometer measurements indicate no dependence between the measurement time and the increment selected. In reality, all of the data are plotted on a continuous line at 13 seconds, which is the time used to measure both light sources and all increments combined. Specifically, the photometer’s electronic circuitry adapts its digital signal processing to guarantee that the signal level remains good throughout the measurement procedure, thanks to adaptive modification of the digital signal processing.

In terms of qualitative behavior, the photometer data for changes in luminous flux show qualitatively the same behavior as the spectroradiometric data for the same parameters. Due to the rapidity with which the photometer measures, a high-resolution measurement with usually 4 to 5 C-planes takes just around one minute to complete.

Conclusion
The ability to save precious measurement time in the daily laboratory routine is critical in the field of goniophotometry. A goniophotometer user must select a measuring routine that achieves a reasonable balance between the two main objectives of “time” and “quality” in order to meet the obvious trend toward high-quality light in Solid-State Lighting applications.It is essential to note that the choice of detector type (spectroradiometer or photometer) has a significant influence in this regard. Hence, LISUN provides the most perfect goniophotometers.

Furthermore, the measurement duration and the quality of the measurement are influenced by a variety of variables, including the spatial radiation characteristics of the source, the scanning resolution utilized, and the kind of goniometer used. This paper presents some practical advice on how to effectively bridge the gap between a quick and a high-quality measurement for two different SSL sources, as well as on how to validate the recorded data in terms of its overall quality.

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