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Multielements Devices

VIGO Photonics’s 32-element array is now available, with dedicated preamplifier. The detectors line is a set of individual active elements and the signal of each of them is output independently. A multielement detector, unlike a single-element detector, allows to record radiation of different wavelengths at the same time.

Multielement detectors and modules – MCT / INASSB

VIGO specializes in customized detectors and modules dedicated to the client’s application. 32-element arrays are now available in production with dedicated preamplifiers.

Most of the multielement detectors produced in the VIGO Photonics are based on HgCdTe (epitaxial HgCdTe heterostructure) photovoltaic detectors, thermoelectrically cooled.

Chart 1 presents examples of spectral characteristics and Table 1 – parameters of detectors optimized for different wavelengths.

See specification

Chart 1. Exemplary spectral detectivity

Table 1. Detectivity and time constans of HGCDTE detectors

Optimum wavelength λopt, µm 3.0 3.4 4.0 5.0 6.0 8.0 10.6
Detectivity D* (λopt), cm·Hz1/2/W ≥7.0×1010 ≥4.0×1010 ≥3.0×1010 ≥9.0×109 ≥2.0×109 ≥2.0×108 ≥1.0×108
Time constant τ, ns ≤280 ≤200 ≤100 ≤80 ≤50 ≤45 ≤10

Our technological capabilities also allow the production of multielement detectors with InAsSb (indium arsenide antimonide) using the MBE (Molecular Beam Epitaxy) method.

These devices are complying with the RoHS Directive. They are designed for applications where higher resistance to difficult operating conditions should be ensured.

The great advantage of VIGO Photonics multielement detectors is that there is no need for cryogenic cooling. This results in a reduction in the size and weight of the device, and hence a reduction in power consumption.

Figure 1 shows the dimensions (unit: mm) of TO8 16pin (a) and flatpack 40pin (b) housings in which VIGO Photonics multielement detectors are mounted.

Figure 1. Mechanical layout

Key features of the product

Advantages:

– High sensitivity

– High-speed response

– Convenient cryogenic-free operation

The key advantages of VIGO Photonics multielement detectors are very high accuracy and measurement speed. In temperature measurements, accuracy of a single millikelvin is achieved, even when measuring an object present in the field of view for only a few microseconds.

In spectrophotometry, these advantages allow obtaining high-quality measurements in a short time. Measuring the entire spectral range at the same time shortens the measurement time (compared to the time needed for scanning and full spectrum analysis in one-piece detectors).

Table 2 presents the parameters of VIGO Photonics multielement detectors, selected for the needs of individual applications.

Table 2. Parameters

Parameter Value
Array format linear or bilinear, up to 32 elements
Active elements material HgCdTe or InAsSb
Detector type PV (phtovoltaic) or PC (photoconductor)
Operating wavelength MWIR (λcut-off: 3.0 to 8.0 µm)
LWIR (λcut-off: 8.0 to 14.0 µm)
λcut-on can be optimized upon request
Pixel size minimum 25×25 μm
Cooling 2- or 3-stage TEC
Active elements temperature 210 – 270 K
Temperature sensor thermistor or diode (accuracy up to ±1 K)
Time constant 1 – 500 ns
Package TO8 16pin or flatpack 40pin
Window Si/Al2O3/Ge with or without anti-reflection coating, planar or wedged
Ambient temperature 0 to 70°C
Storage temperature -20 to 50°C

VIGO Photonics multielement detectors are offered with a wide range of accessories. Accessories can be tailored to the needs of application and integration with the user’s system.

Table 3 shows the examples of solutions.

Table 3. Accessories

Accessory Description
TEC controller onboard analog controller
Lens mount C-mount 1” or SM1 THORLABS
Preamplifier ultra-low noise, selectable bandwidth
DAQ SPI or USB HS

Applications

Multielement detectors are used in point, non-contact temperature measurements of fast moving elements. Real-time monitoring of temperature of external and internal wheel bearings and high-speed train brakes can serve as an example. As other examples can also be used: temperature measurements on production lines, anomaly detection, monitoring of cooling or combustion profiles.

Currently available spectrophotometers usually use the near infrared range of 0.8-2.5 μm. Organic compounds, greenhouse gases, hydrocarbons can be more precisely observed in the MWIR (3.0 – 8.0 µm) and LWIR (8.0 – 14.0 µm) ranges. The use of multielement detectors allows to eliminate the need for filters or use moving mechanical elements for scanning the spectra or space, and, consequently, eliminates errors related to their work. VIGO Photonics multielement detectors allow for high-quality spectrophotometric measurements in a short time and very low noise also allows for operation with low-power sources: thermal or IR diodes.

High performance optical sorting systems are another application of multielement detectors. The detector line allows imaging elements moving on the tape and testing the chemical composition. Optical sorting can be used in the mining, food, chemical and pharmacological industries.

VIGO Photonics offers the smallest on the market, environmentally friendly MWIR detection modules with the overall chip dimensions of 10 x 10 x 3 mm. Affordable detection modules are based on InAsSb semiconductor material which means no more mercury or cadmium, resulting in a RoHS compliant device.


 

https://vigophotonics.com/app/uploads/sites/3/2022/07/img_affordable_dm.webp

AM03120-01, Affordable MWIR InAsSb detection module, is an ”all-in-one” uncooled IR detection module in a compact TO8 package. Photovoltaic mutiple junction InAsSb detector element is directly integrated with a low-noise preamplifier. Amplified analog output may be connected directly to the measurement equipment. Through-hole mounting is possible. The detection module is supplied with an anti-reflection coated window preventing unwanted interference effects. The final product can be offered as an OEM component (only PCB with detector element), mounted on a TO8 sumbount or mounted and sealed in a TO8 package with a window.

Table 1. Specification (TA = 20°C, RL = 1 MΩ, F0 = 500 KHZ)*

Parameter Min Typ Max
Cut-on wavelength λcut-on (10%), µm 2.3
Peak wavelength λpeak, µm 4.4 4.6 4.7
Cut-off wavelength λcut-off (10%), µm 5.9
Detectivity D*(λpeak), cm·Hz1/2/W 3.4×108 5.5×108
Output noise voltage density vn, nV/Hz1/2 100 130
Noise equivalent power NEP(λpeak), nW/Hz1/2 0.18 0.30
Voltage responsivity Rvpeak), V/W 559
Low cut-off frequency flo, Hz DC
High cut-off frequency fhi, Hz 2M
Transimpedance Ki, V/A 4.65k 4.70k 4.75k
Output impedance Rout, Ω 49.5 50.0 50.5
Output voltage Vout, V 0
0

2.50 (RL = 1 MΩ)
1.25 (RL = 50 Ω)
Output voltage offset Voff, mV -10 +10
Power supply voltage Vsup, V ±3
Power supply current Isup, mA 20
Power consumption, mW 120
Active element material epitaxial InAsSb heterostructure
Active area A, mm×mm 1×1
Package TO8
Acceptance angle Φ ~48°
Window wZnSeAR

Key features of the product

Technological possibilities of VIGO Photonics allow for the production of InAsSb (indium arsenide antimonide) detectors, using modern methods of MBE (Molecular Beam Epitaxy) epitaxy. Affordable detection modules are designed for applications where higher resistance to harsh operating conditions must be ensured.

InAsSb modules are compliant with the RoHS directive, which means our products ensure the consumer market safety! The affordable price is a strong advantage along with the highest quality materials.

The modules are easy to use thanks to:

– signal already amplified, voltage output,
– availability on a standard submount (TO8),
– availability for a direct mounting onto user’s PCB (OEM version),
– small size.

Affordable MWIR InAsSb detection module (AM03120-01) is available for purchase in three options. AM03120 is a detector in the TO8 package. AM03110 is a detector on a steel base. It is also possible to order a miniaturized chip, size 10 x 10 x 3 mm, with an amplifier on the PCB – AM03100. Below are the options described:

Applications

Affordable detection module is used in various applications. Due to its high speed response, it is suitable for applications when MWIR fast pulse laser carries information, for example MWIR spectroscopy. Affordable module is designed for space limited and low power applications. It saves space due to a built-in trans-impedance preamplifier which is not necessary in customer’s application. Its added benefit is a low power consumption which suits, i.e., battery operation devices. Remaining applications are the following: laser metrology, monitoring of industrial and laboratory processes, laser power monitoring and control. The device is being developed in terms of creating new features: digital output, thermoelectric cooling etc.

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