InSb探测器

Judson Technologies LLC 221 Commerce Drive Montgomeryville, PA 18936 USA Tel: 215-368-6900 Fax: 215-362-6107 Visit us on the web. www.judsontechnologies.com Indium Antimonide Detectors ISO 9001 Certified J10D Indium Antimonide Detector Operating Notes (1.0 to 5.5 µm) Operation InSb detectors are photovoltaic and generate current when exposed to infrared radiation. Figure 23-2 shows the equivalent circuit for InSb, including the shunt resistance RD, junction capacitance CD and shot noise. The shot noise results from the DC current I BG produced by the background infrared radiation. Because IBG is proportional to the detector active area (Fig. 23-5), smaller detectors have less shot noise and lower values of NEP. Applications • Thermal Imaging • Heat-Seeking Guidance • Radiometers • Spectrometry • FTIR Description J10D Series detectors are high quality Indium Antimonide (InSb) photodiodes, providing excellent performance in the 1 to 5.5 µm wavelength region. Single crystal p–n junction technology yields high speed, low noise detectors with excellent uniformity, linearity and stability. Field of View A standard cold field of view (FOV) is provided at no extra charge. A custom field of view can be supplied for a small extra charge. Detectivity can be im- proved and IBG reduced by restricting the FOV angle. The FOV cold stop angle should be chosen to restrict unwanted background radiation while still accept- ing all desired radiation from the optical system. A 60° (full-angle) FOV, corresponding to 1/F optics, is provided unless other- wise specified. Cold Filters Optional cold filters can improve detectivity by eliminating background radiation in unwanted wavelength regions. The D* performance with the SP28 cold filter (0.5-2.8µm) and the SP35 cold filter (1.7-3.5µm ±0.3µm) is shown in Figure 23-1. Other bandpass filters are available on a custom basis. Dewar Packages All J10D Series InSb detectors require 77°K operating temperatures. The detector comes mounted in the standard M204 or M205 metal dewar with a sapphire window and a 60° Field of View. Other window and dewar options are also available. All InSb detectors can be provided in the LC1 Dewar Cooler Assembly or the RC2 Detector Cooler Assembly for operation without bulk liquid nitrogen. Custom Detectors Specifications for linear position sensors, quad cells, and two-color (sandwich) detectors are given in our catalog. InSb detectors in any size up to 7mm diameter and in any configuration can be provided on a custom basis. Preamplifiers Optimum performance is achieved when the InSb detector is coupled into a Judson transimpedance gain preampli- fier, which converts detector output current to voltage while maintaining the detector at the optimum zero volt bias (Fig. 23-3). The PA-9 preamplifier is specifically matched to each InSb detector to provide maximum sensitivity, gain and bandwidth. The lower-cost, adjustable gain PA-7 preamplifier is suitable for lower fre- quency applications (DC-10KHz). When selecting preamp gain, choos- ing the largest practical value of RF results in the lowest overall noise. However, the detector IBG must be considered to avoid DC saturation of the preamp. Example: The J10D-M204-R01M has a background current (IBG) of 7µA (from Fig. 23-5). Choosing RF= 1MW would result in a gain of 106, for a DC output of (7µA x 106 V/A) or 7V. This is near the saturation level of both the PA-7 and PA- 9. Consequently, a gain of 106 is the maximum useable DC gain with this detector. An AC-coupled second stage may be added for further amplification. The background current I BG may be reduced by adding a cold filter or reduc- ing the field of view. 1 2 3 4 5 6 10 10 10 1 2 11 1 0 wit h S P28 co ld f ilte r with SP 35 cold filte r FOV = 60° FOV = 180 ° Detector Temp = 77°K Wavelength (µm) D * ( l , 1 K H z, 1 H z) (c m •H z/ W ) Typical Specifications J10 Series InSb @ 77°K, 60° FOV Figure 1 Detectivity vs Wavelength for J10D Series InSb Figure 2 InSb Photodiode Equivalent Circuit Figure 3 Basic Operating Circuit for InSb Max. RF for InSb determined by (IBG) Fig. 19-5. Max. recommended DC voltage is 5 volts. V offset = IBG x RF Figure 6 Noise Equivalent Power (NEP) vs Frequency Figure 5 Background Current IBG Current vs Active Size Figure 4 Detectivity vs Temperature for J10D Series InSb C R R D D S ISIph VD Iph = Current generated by incident photons VD = Actual voltage across diode junction CD = Detector junction capacitance RD = Detector shunt resistance RS = Detector series resistance IS = Output signal current L O A D IS RF Vo = IS x RFVos + - Ib Recommended Op Amp: Burr Brown OPA111 ��� ����� � �� � �� � � � � � �� � �� ������������������������ �� �� �� �� �� � �� � �� !" �� �# $� % �� �� #� �& ' �� () � )��*+��,*��� *����������� -� -�. -. � � � -� � � � � ��/ 01 2 ��/ 01 � ��/ 01 ����3�& ' �*4� %������#� "�#�����$�5��� 6��!"���#$���$*��*�#- � 7 8 �� �� �� �� �� � � � � -� � � � � � 2 � � . /��9��#�:����� -�.��� &) ���� &) )��*+��,*�� ��� &) 8� �� �� �� *4� Model Number Active Size (dia.) Judson P/N Peak Respon- sivity D* @ λpeak and 1KHz NEP @ λpeak and 1KHz Back- ground Current IBG Open Circuit Voltage VOC Shunt Resistance RD @ VR = 0V Capaci- tance CD Standard Packages (mm) (A/W) (cm Hz1/2W-1) (pW/Hz1/2) (µA) (mV) (Ω) (nf) Dewar Window J10D-M204-R100U-60 0.10 400151 3.0 1 x 1011 0.08 0.15 90 to 120 >25M 0.01 Side- J10D-M204-R250U-60 0.25 400007-2 3.0 1 x 1011 0.2 0.4 90 to 120 >10M 0.03 Looking Sapphire J10D-M204-R500U-60 0.50 400038-2 3.0 1 x 1011 0.4 2 90 to 120 >1M 0.1 M204 Amtir J10D-M204-R01M-60 1.00 400005-1 3.0 1 x 1011 0.8 7 90 to 120 >500K 0.4 M200 1-6µm J10D-M204-R02M-60 2.00 400016-1 3.0 1 x 1011 1.6 30 90 to 120 >150K 1.6 Down- AR J10D-M204-R04M-60 4.00 400010-1 3.0 1 x 1011 3.0 110 90 to 120 >40K 6 Looking Silicon J10D-M204-R07M-60 7.00 400057-1 3.0 1 x 1011 6 350 90 to 120 >10K 20 M205 221 Commerce Drive Montgomeryville, PA 18936 USA Tel: 215-368-6900, Fax: 215-362-6107 www.judsontechnologies.com March, 2003 jds In addition to our Indium Antimonide product line, Judson Technologies offers a wide range of high performance standard, custom and space qualified detector products and accessories. ! Germanium detectors and arrays ! Indium Arsenide detectors and arrays ! Mercury Cadmium Telluride detectors and arrays ! Lead Selenide detectors and arrays ! Lead Sulfide detectors and arrays ! Dewars, backfill and vacuum packages ! Thermoelectric, Joule Thomson and closed cycle linear and rotary coolers ! Preamplifiers ! Temperature controllers and readout electronics Please contact us for more information on these products at 215-368-6900 or on the web at www.judsontechnologies.com.