sglux - house of photodiodes - from 120nm to 1700nm

sglux has established itself as a well-known brand for SiC photodiodes and sensors worldwide. Going this path, sglux has ventured into designing of customer-specific photodiodes, becoming a one-stop agency for all measurement requirements in the wavelength range from vacuum UV to infrared radiation. These can incorporate one or more chips, filters and optics, SiO₂ diffusers or VUV-transparent MgF based windows.

Our offering
• Application-specific design of detectors or assemblies based on SiC, GaP, InGaP, InGaAs, Si, Ge, or any other material suitable for the application
• Use of commercially available optical filters, diffusers, and lenses, as well as in-house development if these are not available on the market.
• Integration of temperature sensors
• Circuit development for processing photocurrents (often only a few nA) into standard process variables, such as 0-5V, 4-20mA, or digital, for use in photodiode housings (sglux TOCONs) or outside
• Assembly and connection technology
• Development of special housings

Our strengths
• We enjoy implementing special concepts and have over 20 years of experience in building complex detectors with or without amplifiers, with or without filters, with one or more different chips, always with the highest possible precision and long-term stability.
• In-house production of SiC photodiode chips in three variants: standard, VUV, and APD, as well as the production of InGaP photodiode chips.
• Extensive experience in working with other chips, such as GaP, InGaAs, Si, Ge.
• High-performance calibration laboratory with first-class equipment, constant exchange with the PTB, regular “round robins” with other leading suppliers in Germany for quality assurance, participation in various standardization committees.

TANDEM / 2COLOR / DUO Photodiodes – TWO Photodiodes in ONE Housing

One housing with two chips sensing two different wavelength ranges.
Example: TANDEM-UV-IR
On top is a SiC sensing UV photodiode chip which transmits VIS and IR radiation to the lower part of the structure. A filter blocks VIS radiation. At the bottom of the structure an IR sensing InGaAs chips is placed.

Application: Flame detectors for industrial gas burners.

The emission spectrum of gas burners has peaks in the UV and IR wavelength range (blue and red colour in the picture). sglux TANDEM UV-IR is able to detect both wavelength range separately within one TO-5 package employing a SiC photodiode chip for the UV range and an InGaAs photodiode chip for the IR range. This product is usually applied for circuits compliant to SIL3 level measurements.

The picture shows the sglux « 2COLOR » – two photodiode with different sensitivity range next two each other. « DUO » is also possible – two photodiodes with the same sensitivity range next to each other to provide flame detection with one single photodiode with two separate circuits. It is also possible to include temperature sensors (PT100) into the housing.

What is your multi-spectral measurement task? We accept the challenge!

PHOTODIODEN WITH INTEGRATED BANDPASS FILTER – Example 222nm + UV-C bandpass photodiode

The sglux standard product portfolio includes photodiodes with 3 different bandpass filter: UVC, UVB and UVA. However, for certain applications special bandpass filters such as the UV-Index bandpass are needed. The sglux TO-housing integrated filter technology offers an easy way to include customized filters even at small quantities, or just a single unit.

Application: Arc measurement between pantograph and overhead line in accordance with EN 50317

Between the pantograph and the overhead line arcing may occur. The arc spectrum is dominated by copper (Cu) emissions mainly between 220 – 225 nm and 323 – 329 nm. As the measurement needs to be done in the presence of daylight, the 323 – 329 nm Cu-emission-band overlaps with the sun spectrum. Therefore, an arc-detection sensor must be solar blind. sglux solution employs a combined 222 nm narrow band filter (FWHM 10nm) for the detection of the 220 – 225 nm Cu-emission band according to EN 50317.