VIGO System has introduced an infrared detection module that combines an infrared photodetector, heat dissipation systems, optics, signal processing electronics, and other components in a common package.
Such integration makes detectors less sensitive to electromagnetic interferences, electrostatic discharges, overbias, and other environmental exposures. Other benefits of the integration are output signal standardization, enhanced high-frequency (HF) performance, cost reduction, and miniaturization.
VIGO System provides detection modules that are equipped with an infrared detector. These modules are optimized for uncooled temperatures or for temperatures that can be achieved with Peltier-cooler operation in the spectral range from 2 to 12 μm.
Numerous circuit designs have been designed to improve the performance of the modules in many different applications.
IR radiation discharged by an object is focused on the active area of an IR detector, creating photoelectric signals that are detected by the front-end electronics (FEE).
The front-end electronics circuitry is generally used to:
- Protect detector elements from overbias
- Offer optimum conditions to facilitate the operation of IR detectors (to obtain a rapid response, a wide dynamic range, and high sensitivity. This is usually realized with improved constant voltage bias and the current mode of the photoelectric signal readout.
- Intensify the signal within the needed frequency band. This could be achieved by making sure that the preamplifier noise makes only minimal contribution to the ensuing noise of the detection module.
Besides the front-end electronics, detection modules may feature supplementary electronic blocks for signal conditioning, like filters, gain blocks, analog-digital converters (ADC), thermoelectric cooler controllers, and other components.
Incorporation of a preamplifier, detector, and TEC controller in a compact, sealed package offers considerable benefits, such as better high-frequency performance, miniaturization, enhanced reliability, immunity to electromagnetic interferences (EMI), user-friendly operation, and reduced costs.
Three models are available in the universal module series:
- Improved for operation in the spectral range of 2 to 12 μm and a frequency bandwidth ranging from DC to 100 MHz with an optically immersed photovoltaic multiple junction detector
- Improved for operation in the same frequency bandwidth and the same spectral range but includes photovoltaic multiple junction detector without immersion microlens
- Improved for operation in the spectral range of 3 to 6.7 μm and a frequency bandwidth ranging from DC to 1 MHz with an optically immersed photovoltaic detector
The output signal is the standard voltage with 50 Ohms impedance (50 Ω). Extra DC output comes as a standard. The low-cost OEM version is also available for a minimum order quantity of 100 units.
Apart from being user friendly and convenient, the module series can be employed in several applications, like fuel combustion monitoring at power plants; gas detection, monitoring, and analysis; power monitoring and control; laser calibration; carbon dioxide laser (CO2) measurements; and contactless temperature measurements.
Source: VIGO System
||Optimal wavelength λopt, µm
||Optical area Ao, mm×mm
||Detectivity D* (λopt), cm·Hz1/2/W
||Output voltage responsivity Rv (λopt, RL=50 Ω), V/W
|| -3 dB Bandwidth
||DC to ≥ 100 MHz
||DC to ≥ 100 MHz
||DC to ≥ 1 MHz