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Pyroelectric linear arrays

Pyroelectric Linear Arrays

The LTx family of pyroelectric linear arrays is specifically designed for non-contact temperature measurement and infrared spectrometry. The arrays include a lithium tantalate chip with 128, 256 or 510 elements. The signals produced by the elements are processed in a CMOS circuit. Signal processing is carried out by the analogue circuitry, including an adapted low-noise preamplifier for each pixel, a multiplexer, an output amplifier. The pyroelectric chip and CMOS readout circuit are located on a thick film substrate, which is mounted inside a hermetic metal housing. The incident radiation passes through a window or filter, is transparent to infrared wavelengths, and reaches the sensitive elements.








The preamplifiers transform the signal charges of each pixel into a signal voltage, include bandwidth limiting and pass the amplified signal to the sample & hold for the read-out process. The digital inputs are CMOS compatible. For measurement of the detector temperature a sensor (type AD 590) is integrated into the package. It provides an output current which is proportional to the temperature.


In common with all pyroelectic detectors, the incoming infrared radiation needs to be modulated for a measurement to be made. Ion-beam milled pyroelectric detector chips with a thickness of approximately 5 μm enable a high responsivity and a low noise equivalent power NEP. An additional metal black coating („M“ in type designation) realizes a high and homogeneous spectral absorption. Detector chips with ion-beam etched thermal isolation trenches („SL“ in type designation) allow low modulation frequencies up to 10 Hz with excellent signal/noise-ratio.











Key Specifications:

 - Lithium tantalate pyroelectric arrays with high longterm stability

 - 128, 256 or 510 elements with 100 µm, 50 µm

   or 25 µm pitch respectively

 - Integrated CMOS multiplexer and temperature sensor

 - Coated Ge or Si filters

 - Many types with ion beam milled thin sensor elements for

   high signal-to-noise-ratio

 - Option: metal absorbing layer for high and

   spectral uniform absorption

 - Option: ion beam etched trenches between the sensor elements for

   excellent signal-to-noise-ratio at low modulation frequencies (e.g. 10 Hz)


Customized Infrared Arrays:

 - Up to 510 elements with adjusted element geometry

 - 25 µm minimum pitch

 - Dual line sensors with two side by side placed pyroelectric arrays, 

   each with up to 256 elements

 - Special narrow and wide band-pass filters, variable filters

 - Integrated CMOS multiplexer and temperature sensor

 - Hermetic metal housing

 - Customized sensor modules with sensor electronics and if applicable 

   optical channel














Typical wavelength dependence of the 

spectral absorption of the optimal metal

absorber.



Evaluation Kit

The Evaluation Kit allows easy operation of the PYROSENS arrays. It consists of a small circuit board with complete electronics and software by which the electronics is controlled via USB connection from a Windows PC. The power can be provided by the USB port or a separate power supply (9 V). For synchronisation with further external components, such as for radiation modulation, a trigger pulse is provided. The read-out cycle can be adjusted between 1 and 30 lines/s. 


A DLL interface for the integration of the evaluation kit in custom software solutions and common laboratory software is available. Thus, commissioning and integration of PYROSENS arrays in their own software and system solutions become even easier. The interface permits access to all array parameters via API functions and reading out the pixel values. 


The evaluation kit can be integrated into a variety of software environments, e.g. 

– NATIONAL INSTRUMENTS LabVIEW 

– MathWorks MATLAB 

– Microsoft Visual Studio 

– Embarcadero RAD Studio 


For the development of software in C / C ++ corresponding header and lib files are included.



























Please check the table below for individual specifications tied to individual products.

Product Brochure Link: Pyroelectric Linear Arrays 


 What does the name of the array say?

PYROSENS256LTMISLSP0.5V3
Pixel number (128, 256 or 510)






Lithium tantalate
Metal black coating
Ion beam etched (higher responsivity)
Thermal isolation trenches
Array optimized for spectroscopic application
Pixel length in mm (0.5 mm or 1.0 mm, without indication 0.1 mm)
Optional internal gain factor (3, 5, 8 or 16)


Pyroelectrical Linear Arrays – Types and Features
TypeSensitive ElementSensor Parameters1
NumberWidth [µm]Length
    [µm]
Pitch [µm]fCh  in HzSV  in 103 [V/W]uR  [mV]NEP [nW]MTF
    (R = 3 lp/mm)
Uniformity of SV   [%]
Element length 0.1 mm
128LT128901001001282300.73.00.65
128LTI128901001001285400.81.50.610
128LTMI128901001001286200.81.30.68
128LTMI SL128901001001080000.80.10.810
128LTMI SL128901001001286200.81.30.810
256LTI25642100501286200.71.10.610
256LTMI25642100501287100.71.00.68
256LTMI SL25642100501091000.70.080.810
256LTMI SL25642100501287100.71.00.810
510LTI51020100251286800.91.30.810
Element length 0.5 mm
128LT SP0.5128905001001282300.93.90.610
128LTI SP0.5128905001001285401.22.20.610
128LTMI SP0.5128905001001286201.21.90.68
128LTMI SP0.5 V31289050010012819003.21.70.68
128LTMI SL SP0.5128905001001080001.20.150.810
128LTMI SL SP0.5128905001001286201.21.90.810
128LTMI SL SP0.5 V31289050010010240003.20.130.810
128LTMI SL SP0.5 V31289050010012819003.21.70.810
256LTI SP0.525642500501286200.91.40.610
256LTMI SP0.525642500501287100.91.20.68
256LTMI SL SP0.525642500501091000.90.100.810
256LTMI SL SP0.525642500501287100.91.20.810
256LTI SP0.5 V3256425005012818502.21.20.610
256LTMI SP0.5 V3256425005012821002.21.00.68
256LTMI SL SP0.5 V3256425005010270002.20.080.810
256LTMI SL SP0.5 V3256425005012821002.21.00.810
256LTI SP0.5 V5256425005012831004.51.40.610
256LTI SP0.5 V8256425005012849506.51.30.610
256LTI SP0.5 V162564250050128990013.01.30.610
510LTI SP0.551020500251286801.31.70.810
Element length 1.0 mm
128LT SP1.01289010001001282301.14.90.610
128LTI SP1.01289010001001285401.93.50.610
128LTMI SP1.01289010001001286201.93.00.68
256LTI SP1.0256421000501286201.11.80.610
256LTMI SP1.0256421000501287101.11.60.68
256LTI SP1.0 V32564210005012818503.01.60.610
256LTI SP1.0 V52564210005012831005.61.80.610
256LTI SP1.0 V82564210005012849508.51.70.610
256LTI SP1.0 V1625642100050128990017.01.70.610
256LTMI SP1.0 V32564210005012821003.01.40.68



1 Typical values, rectangular chopping with fCh , array temperature 25 °C, black body source temperature 400 °C, filter transmission 100 %.


fCh ... Chopper frequency for rectangular modulation 

SV ... Sensitivity 

uR ... Noise voltage

NEP ... Noise equivalent power 

MTF ... Modulation transfer function





Electrical Specifications

Electrical Parameters3
ParameterMinimum valueTypical valueMaximum valueUnit
VDD4.755.05.25V
VD22.42.52.6V
Digital inputs, low voltage0
0.3 VDDV
Digital inputs, high voltage0.7 VDD
VDDV
Digital inputs, switching threshold
0.5 VDD
V
Digital inputs, leakage current

± 1µA
Current consumption
8
mA
AD590 operating voltage44 5
30V


All values for VDD = 5 V, VD2 = 2,5 V. 

4 See data sheet of Analog Devices.

5 Valid for 510LTx.


Pins – 128LTx, 256LTx and 510LTx
PinNameFunctionPinNameFunction
1CLKInput clock CLK (trigger on rising edge)9OUT, OUT16Analog signal output, analog signal output (odd pixels)6
2RESInput clock RES (active low)10GNDGround
3VVRInput clock VVR (active high)11n.c., OUT26Not connected, analog signal output (even pixels)6
4VDRInput clock VDR (active high)12AD590+Temperature sensor
5VSHInput clock VSH (active high)13AD590–Temperature sensor
6VD2Operating voltage (+2.5 V)14caseCase
7VDDOperating voltage (+5 V)15GNDGround
8VD2Operating voltage (+2.5 V)16VDDOperating voltage (+5 V)

6 Only available for 510LTx.


Internal Read-out Circuit


Clock parameters1
ParameterRelative valueMinimum valueTypical valueMaximum valueUnit
Chopping frequency2  fCh
10128512Hz
Readout CLK fCLK  = 2 ∙ fCh  ∙ 2681/tCLK069300kHz
Reset clock low-impulse duration tRES1/2 tCLK1.87.5
µs
Clock VVR high-impulse duration tVVR2 tCLK7.530
µs
Clock VDR high-impulse duration3  tVDR28 tCLK200400
µs
Clock VSH high-impulse duration tVSH1 tCLK3.515
µs
Setting time at the output tout


1µs



Linear Variable Filter


Introduction

Infrared Linear Variable Filters are narrow band filters where the Centre Wavelength (CWL) changes with distance along it’s length, this is shown in the diagram below for a 2.5-5.0 µm type. Our range of stock LVF s allow the user an opportunity to explore the technology but at a relatively low cost.

1. Our stock LVF s cover 3 ranges 0.9-1.7 µm, 1.3-2.5µm and 2.5-5.0µm , these can be purchased from our web-shop.

2. We also manufacture custom LVF’s, contact us to discuss further.

3. Applications include mini-spectrometers, multi-gas analysis,industrial process monitoring and many more.


Features of Generation 2 Infrared Linear Variable Filters

 -  2 ranges covered, 0.9-1.7µm and 1.3-2.5 µm.

 - Width/FWHM =1% x Centre Wavelength.

 - Blocking greater than OD 3.5 average outside passband.

 - Specifically for systems where higher signal to noise ratio is critical.


Features of 1st Generation Infrared Linear Variable Filters

 - 3 ranges covered, 0.9-1.7µm, 1.3-2.5 µm and 2.5-5.0 µm.

 - Width/FWHM =2% x Centre Wavelength.

 - Blocking greater than OD 2.5 average outside passband.


LVF Performance Explained

The diagram below shows the performance ‘end to end’ of a 2.5µm-5.0µm LVF.





LVF Part Numbers Explained

Example: LVF 2.5 – 5.0 – 15.0 – 3.5 – 0.5



Please check the table below for individual specifications tied to individual products.

Product Brochure Link:  Linear Variable Filters Content Brochure


Product NumberRangeDimensions (Length x Width x Thickness)Bandwidth (as a % of centre wavelength)
LVF 0.9-1.7-3.5-15-0.5-2%0.9   – 1.7 µm15   x 3.5 x 0.5 mm2% (Generation   1)
LVF 1.3-2.6-3.5-15-0.5-2%1.3-2.6   µm15   x 3.5 x 0.5 mm2% (Generation   1)
LVF 2.5-5.0-3.5-15-0.5-2%2.5-5.0   µm15   x 3.5 x 0.5 mm2%   (Generation 1)
LVF 0.9-1.7-3.5-15-0.5-1%0.9   – 1.7 µm15   x 3.5 x 0.5 mm1%   (Generation 2)
LVF 1.3-2.6-3.5-15-0.5-1%1.3-2.6   µm15   x 3.5 x 0.5 mm1%   (Generation 2)



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Spectroscopy & Microscopy Solution

Check our solution page Spectroscopy Solutions | Microscopy Solutions



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