Understanding Auto-Gating and Auto-Gain for Night Vision Devices
Engineer Manager Name: Sophia
WhatsApp/ Wechat: 0086-18109189213
E-mail: Sophia@ireeda.com
Automatic gating
Product overview
The auto-gating power supply is an important component of the low-light image intensifier, which provides energy for the electronic optical system of the low-light image intensifier, that is, provides the operating voltage for the cathode, MCP and anode.
Technical Features
Using pulsed high voltage as the cathode output, and taking advantage of the microprocessor to sample the output brightness signal of the fluorescent screen to control the duty cycle of the cathode output pulse, combined with the voltage control at both ends of the MCP, to achieve the effect of constant output brightness of the image intensifier under a large illumination range. The dynamic range of the low-light image intensifier using auto-gating power supply has been greatly expanded comparing with traditional image intensifier, and because of its intermittent power supply, the service life of the low-light image intensifier can be effectively extended.
Parameter list
Input voltage ：2~4V (rated 3V)
Input current： ≤35mA (rated voltage 3V)
Cathode turn-on voltage： 200±20V
Cathode turn-off voltage ：≥10V
Rise and fall time ：≤50ns
Cathode minimum gate width ：≤500ns
Theoretical dynamic range ：160dB
Weight ：≤15g
Application fields
It includes 16mm, 18mm, 25mm, 40mm, etc multi-caliber ultra-second-generation low-light image intensifiers, UV image intensifiers, etc.
Automatic gain
Product overview
An automatic control method that allows the gain of an amplifier circuit to be automatically adjusted according to the signal strength.
Specific requirements for automatic gain control circuits
(1) Large gain control range:
(2) Maintain good signal-to-noise ratio characteristics of the system:
(3) High control sensitivity:
(4) When the control gain changes, the amplitude-frequency and group delay characteristics remain unchanged to reduce signal distortion:
(5) The control characteristics are less affected by temperature.
Engineer Manager Name:Sophia
WhatsApp/ Wechat: 0086-18109189213
E-mail: Sophia@ireeda.com
