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TPMI 데이터시트(PDF) 3 Page - PerkinElmer Optoelectronics |
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TPMI 데이터시트(HTML) 3 Page - PerkinElmer Optoelectronics |
3 / 5 page Details Details The signal voltage generated by the thermopile detector is preamplified by a programmable low noise amplifier. The amplification is adjustable in several gain ranges, each range allowing a 8-bit adjustment in the amplification. Depending on the object temperature being higher or lower than the actual ambient temperature of the thermopile, the thermopile voltage signal can be positive or negative. In order to allow signal processing of negative voltages with a single voltage supply system, the internal amplifiers are referred to an internal bandgap reference of 1.225V. For offset voltage trimming of the amplification, the preamplifier is followed by a programmable trimming stage, generating an offset voltage. The internal temperature of the thermopile sensor is recorded by a calibrated temperature sensor with linear characteristics. The signal of this temperature reference is amplified and processed by a polynomial processing unit to adapt it to the non-linear ~T4 shape of the amplified thermopile curve in order to achieve the optimum of ambient temperature compensation. The characteristics of the temperature reference signal (offset and slope) are adjusted by PerkinElmer during the production process. The output signal (the object temperature range) can be adjusted in a wide range to suit the application requirements. Optionally, via an analog switch, the temperature compensation can be disabled. The TPMI additionally features two comparators with programmable set points and hysteresis, which make an easy remote temperature control in industrial processes possible. It can use the TPMI as a temperature dependent switch for alarm purposes. Figure 3: Schematics of the TPMI The ambient temperature compensated signal representing the object temperature is supplied to the output VTobj. The temperature reference signal or alternatively the bandgap reference voltage is available on a second output pin, VTamb. Both outputs are short circuit stable. The control unit offers a bi-directional synchronous serial interface to access the configuration memory for the adjustment of ASIC parameters, the trimming of the ambient temperature sensor, the calibration of the thermopile detector, and to permanently store information. After power-on, the stored information is automatically copied to random access registers that can be changed via the serial interface. Any changes made to the registers are lost after power interruption or will be overwritten with the permanently stored data after the TPMI is powered up the next time. This gives flexibility to the calibration of the sensor in the factory and opens up the opportunity to deliver the customer a plug & play device, which is possible to be adapted according to the specific application requirements. www .perkinelmer .com/optoelectr onics TPMI™ - TPMI™ - Thermopile Sensor Module Thermopile Sensor Module With Integrated Signal Pr With Integrated Signal Processing ocessing Page 3 |
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