Main Parameters of Detector

Photoelectric Properties

*1 Focal plane temperature = -20℃

*2 The deviation between the pixel response signal and the average value is less than the percentage of pixels within a certain range

*3 Test conditions: focal plane temperature = -20℃, 8th gain, integration time 0.5ms

Mechanical Property

Operating Environment and Power Consumption Parameters

*TEC is not turned on, ambient temperature = 25℃, clock frequency = 1MHz, VDDD = VDDA = 3.3V, VBOP = 2.4V, VBOUT = VREF = VNDET = 2.3V

Mechanical Parameters

This detector adopts metal packaging, filled with high-purity nitrogen at normal pressure, the metal shell is made of FeNiCoSi alloy, the surface is electroplated with Ni/Au layer, the window welding method is bonding, and the cover is resistance welding. The detector size is 55mm (L) × 32.6mm (W) × 13mm (H). There are thirty-eight Φ0.5mm pins on the shell leading out from the back, with a pin spacing of 1.78mm, which are used for the input of focal plane power supply and command, focal plane detection signal and electrical lead-out of temperature sensor; two Φ1.0mm pins on the side are used for the connection of thermoelectric cooler. There are four Φ2.5mm through holes on both sides of the tube shell for fixing the detector.

Optical Parameters

Optical Structure

This product uses a 512×1 element InGaAs focal plane, with 2 redundant elements on each end, that is, the total number of pixels is 516×1. In actual use, it is recommended to use the 3rd to 514th columns. The pixel shape is rectangular, the photosensitive size is 25μm×250μm, and the structure is arranged in a "one" shape, as shown in the figure below.

The optical window material is K9 glass with a thickness of 1.8mm and a transmittance of >90% in the response band. The center of the photosensitive surface is located at the center of the detector, with a relative position offset of ≤0.05mm and a relative rotation displacement of ≤0.02mm. The optical interface dimensions are shown in the figure below.

Relative Response Spectrum (Typical Value at Room Temperature)

Electrical properties

Detector pin diagram

Detector Pin Description

Notes:

1) Anti-static measures should be taken during the delivery and use of the detector;

2) Before the detector is powered on, the power supply connection status and drive setting value must be checked to strictly ensure that the working current of each circuit does not exceed 60mA during the power supply process. Short circuit of the signal output terminal is prohibited, and it is recommended to supply power first and then supply timing;

3) DC input directly affects the overall noise of the detector, so the ripple noise of the DC input power supply has the following requirements:

a) VDDA＜2mV

b) VDDD＜10mV

c) VREF、VNDET＜0.3mV

d) VBOP、VBOUT＜1mV

Detector working principle and connection diagram

Detector Timing Description

The overall readout circuit driving timing pulse is shown in the following figure:

IWR mode:

ITR mode:

After zooming in, the timing details at the trigger level ST are as follows:

The overall timing requirements are as follows:

1) The CLK cycle and RESET high level width can be set according to the needs. The recommended CLK frequency range is 1~10MHz, and the RESET low level width cannot be less than 2μs;

2) In IWR mode, the order of SH1, SH2, and SH3 cannot be changed. The specific integration time of the detector is the time from the falling edge of SH1 to the falling edge of SH2 in the same RESET cycle;

3) The ST high level needs to cover a complete CLK high level, and the ST rising edge needs to be within the low level of CLK. It is recommended to set the rising edge at 1/2 of the CLK low level;

4) The actual signal is read from the first CLK rising edge after the ST rising edge. The reference signal R and the output signal S are read out in sequence until the last CLK cycle before the falling edge of SH2 is reached;

5) If the width of RESET high level is not enough to read out all 516 pixels, when the next RESET high level comes, it will still start reading from the first pixel, not from the pixel that has not been read; if the width of RESET high level is too large, it will continue to be empty after reading all 516 pixels of the channel, until the RESET low level comes to reset;

 6) It is recommended to use digital input voltage for SC1, SC2, and SC3, that is, always maintain 3.3V high level/0V low level;

Detector peripheral recommended circuit diagram

Thermal parameters

Thermoelectric Cooler Characteristics

The detector integrates a secondary thermoelectric cooler (TEC). The center of the heat dissipation surface is the center of the lower surface of the detector. The heat dissipation area should be ≥ 20mm×20mm. Its performance parameters are shown in the following table:

* This performance index refers specifically to the temperature difference between the focal plane and the heat dissipation surface of the package structure

Temperature Sensor Characteristics

This detector uses a thermistor as a temperature sensor. The relationship between the resistance value and temperature within the working temperature is shown in the figure below.