New PYRONEER Detector DSV-7341: Highest Measuring Stability Guaranteed
At modulation frequencies in the kHz range, the pyroelectric material DLaTGS (deuterated L-alanine doped triglycine sulphate) achieves up to three times higher detectivity compared to lithium tantalate. This makes DLaTGS detectors the gold standard for use in Fourier transform infrared spectrometers (FTIR).
However, the higher detectivity requires a better thermal stabilization of the detector. Besides that, DLATGS shows a high sensitivity to humidity. InfraTec’s coming soon DSV series detector DSV-7341, designed for both premium and mobile FTIR spectrometers, overcome these challenges with:
Hermetic sealing for outstanding protection against moisture and an
integrated thermo-electric cooling to maintain a stable pyrochip temperature.
Together, these innovations ensure exceptional stability and highly accurate measurements even under demanding conditions. In addition, InfraTec is expanding its PYRONEER family with detectors featuring 2.0 mm DLaTGS pyrochips, which can accommodate larger electronical beams.
Enhanced Moisture Resistance
Zinc selenide (ZnSe) is typically used as window material for infrared detectors, operating in harsh environments, thanks to its excellent moisture resistance. Soldering the window into the detector cap also creates a hermetic seal, further preventing moisture ingress. This guarantees long-term accuracy and extends the lifetime of the detector. An additional anti-reflection coating optimizes the transmission in the mid-IR.
Stable Operating Temperature Inside the Detector
Precise temperature is critical to maximize infrared detector performance and minimize temperature-dependent signal drift. InfraTec addresses this challenge for its DLaTGS detectors of the PYRONEER family by integrating a thermo-electric cooler (TEC) and a negative temperature coefficient (NTC) thermistor.
The combination of these two components enables the detector user to monitor the internal temperature of the detector, regulate the TEC and thus stabilize the active DLaTGS element. This function helps compensate not only for environmental thermal influences but also for varying radiation levels on the detector, e. g. between background and sample. As a result, the detector achieves significantly higher measurement precision and stability.
Steady Feedback for Reliable Temperature Regulation
The NTC thermistor, positioned close to the detector chip, provides an electrical resistance value corresponding to the internal detector temperature. This resistance can be measured at two designated pins of the detector and used as a feedback signal for the external TEC controller.
By changes in the supply current of the TEC the component heats or cools the detector chip if necessary – keeping the working temperature stable and precise. By utilizing a modern design, components, and state-of-the-art manufacturing, the InfraTec detector additionally offers a thermally efficient operation.
The TEC increases the independency of the new PYRONEER detector from environmental conditions – advantageous for both kinds of FTIR, mobile as well as premium spectrometers. The improved packaging of the DSV-7341 enables a simple and reproducible thermal connection to a heat sink, providing a reliable and efficient solution for thermal management.