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Selection od Sensors

Selection of Sensors
Suprema Inc. is supplying a variety of sensor selections with its customers, which is one of its unique strengths compared to its competitors. If you are seeking for the best eligible solution for your applications, please refer to the following sensor information or contact Suprema's sales team for details.

» Technology of different fingerprint sensors

Optical Sensors
With optical sensors, the finger is placed on a plate and illuminated by LED light sources. Through a prism and a system of lenses, the image is projected on a CMOS image sensor. Using frame grabber techniques, the image is stored and ready for analysis.

Thermal Sensors
Thermal sensors contain an array of temperature measurement pixels which make a distinction between the temperature of the skin (the ridges) and the temperature of the air (in the valleys). One dimension of this sensor can be fairly small since a temperature scan can be obtained by sweeping the finger over the sensor.

Capacitive Sensors
Capacitive sensors use a difference between skin-sensor and air-sensor contact in terms of capacitive values. When a finger is placed on the sensor, an array of pixels measures the variation in capacity between the valleys and the ridges in the fingerprint.

Electric Field Sensors
< Electric Field sensor creates an electric field from a ring around the sensing area with which an array of pixels can measure variations in the electric field, caused by the ridges and valleys in the fingerprint. According to the manufacturer the variations are detected in the conductive layer of the skin, beneath the skin surface or epidermis.

» Advantages of Respective Sensors
For your better understanding, we believe that the advantages and specifications of the following sensors could help you out to choose suitable sensors for your applications.

  • Optical sensor has solid sensor surface and is comparatively inexpensive.
  • Thermal sensor has a small form factor and can be low priced for large volume.
  • Capacitive sensor has relatively hard coated surface as a solid state sensor.
  • Electric field sensor has a good performance for contaminated fingerprints.
  • » Specifications of Sensors

    Sensor / Spec
    OP
    FC
    TC1
    TC2
    FL
    Optical Sensor
    Atmel's FingerChip
    UPEK's
    TouchChip
    UPEK's
    TouchChip
    AuthenTec's
    AF-S2
    Sensor Type
    Optical
    Swipe Type Thermal
    Capacitive
    Capacitive
    E-Field
    Resolution(dpi)
    500
    500
    508
    508
    250
    Sensing Area(mm)
    16.0 × 19.0
    14.2 × 0.4
    12.8 × 18.0
    10.4 × 14.4
    13.0 × 13.0
    Image Size(pixel)
    280 × 320
    280 × 8
    256 × 360
    208 × 288
    128 × 128