Infrared waterproof security camera

Model No.: SS-6061C

sensor: 1/3" CMOS PC1089
Pixels: PAL: 752H× 582V NTSC: 768H× 494V
Scanning System: PAL/NTSC
Horizontal Resolution: 600TVL
Minimum Illumination: 0LUX(IR ON)
S/N Ratio: ≥ 48dB
Video Output: 1.0Vp-p/75Ω
AGC: AUTO
AWB: AUTO
Backlight Compensation: AUTO
Exposure Mode: EE
Electronic Shutter: 1/50(1/60) - 1/100000 sec
Gamma Correction: 0.45
Sync. System: Internal Synchronization
IR view distance: 30-40m
LENS: 4-9mm varifocal by hand

Power Supply: DC12V± 5%
Operation Temperature: -10° C_50° C

IR cut is optional

Introduction

In Homeland Security video surveillance installations, many of the requirements involve outdoor surveillance, where surveillance under low-light/no-light conditions is a necessity. In this connection, an earlier Tech. Brief (January 2010) – Low-Light And No-Light Surveillance – Options And Cautions – discussed the optical principles and the technologies that go into enabling low-light/no-light video surveillance.

Standard optical Day/Night video surveillance cameras deliver good image quality both during day and during low-light conditions: colour images during the day and black/white images when the illumination drops below a certain lux level. The quality of images during low-light conditions can be significantly improved through the use of an IR-Illuminator and a mechanical IR-cut filter switch.

This brief looks at how the mechanical IR-cut filter switch (also called ICR) feature, in a camera, can refine image quality during low-light conditions.

IR-Cut filters and ICR

A camera sensor is sensitive to both the visible portion of the electromagnetic spectrum and the Near Infra-Red (NIR) portion of the spectrum.

This feature allows the sensor to form images even under low illumination conditions that a human eye would find difficult to do. However, this sensitivity to the NIR segment of the spectrum results in distorted colours during daylight illumination; therefore, the camera sensor requires an NIR filter (or IR-Cut filter) to be placed between it and the lens, during the day. At night or during low-light conditions, the NIR filter becomes an impediment, in the formation of good quality images, and therefore needs to be removed.

The ICR (IR-Cut filter Removable) is an apparatus that is placed between the camera sensor and the lens, and allows the IR-Cut filter to be placed or removed from the front of the sensor, depending on the illumination level. The ICR is a mechanical shutter, typically powered by a motor, with NIR filter and plain glass panes.