What is the use of integrating spheres and goniophotometers?

In photometry, the light power measurement is performed using two different instruments: a goniophotometer and an integrating sphere. Both have outstanding characteristics that make them suitable for various flux testing and measurement kinds.

Although they are employed for the same purpose, ie, for measuring optical power, they have distinct features and principles. While it is clear that the method of operation in these instruments is different, the kind of bulbs (or light source) examined is also noteworthy. The main distinction between the two resides therein. Here’s a look at the main uses of goniophotometers and integrating spheres.

Integrating sphere
An integrating sphere is a device intended to collect electromagnetic radiation from a source or sample and measure its total optical power. The area consists of a spherical hollow with a highly reflecting yet diffuse inner area and tiny openings for radiation inlet and outlet.

Regardless of the direction of any incoming wave, all radiation spreads equally throughout the sphere, removing spatial uniformities (via spatial integration), but maintaining the original power levels. This enables precise measurement of the entire stream from the source. When high accuracy is required , most applications concentrate on measuring source radiation-typically in the optical band. The sphere itself may also be utilized as a source.

Main uses
Radiometry
They are used to quantify radiant flux from sources or lit samples in combination with high-response photodetectors. A source’s total spectral power is assessed since radiometry does not restrict itself to any specific wavelength band. A radiometer uses this filtering to exclude unwanted wavelengths. Power may be measured spectrally by using an interferometer or diffraction grating.

Photometry
This photometer can measure infrared, visible light, and ultraviolet wavelengths. External sources and geometric dispersion are removed, making it perfect for comparing the brightness of a single light source. Another benefit is that the attenuation of strong collimated sources such as lasers is directly proportional to their spherical shape.

Diffusion and Scattering
A known intensity external light source is used to illuminate the sample to test the transmittance of diffuse sample material. As the spectrum intensity characteristics is indicative of specific material, this is usually desirable.

Goniophotometer
A goniophotometer is an instrument for measuring the light distribution by altering the location of a photometer or a goniometer with a well-defined geometry in terms of light intensity or light distribution from the light source, a luminaire, or self-illuminating display, or surface. A typical goniophotometer is typically a mechanical device or robotic jib that supports the luminaire being measured and a photometer or spectroradiometer and makes it possible to alter its relative location to a spherical locus.

Spectral stream refers to all radiant energy released by a light source across a certain spectrum per unit of time. The total light flux, spectral radiant flux, and color quantities may be derived by evaluating the optical data of the certain angle of spectrum Irradiance. LISUN has both these products of top quality.

Main uses
A goniophotometer for directed light sources is mainly utilized. Unidirectional lights will be measured more accurately by a meter. For many purposes, a goniophotometer may be used:
1. Measurement of light source luminous flow
2. Measuring the distribution of light intensity from a source considerably smaller than the size of the goniophotometer
3. Additional properties may be monitored using color sensors
4. Correlated color temperature distribution
5. Uniformity of color

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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