Solution to the problem of weak signal measurement in radiometric calibration based on Σ-Δ ADC

With the rapid development of optical remote detectors, the radiometric calibration technology is demanded to reach an entirely new level in the precision and long-term stability. A new advanced high-accuracy radiometric calibration technology based on detector can satisfy the needs. Multi-channel absolute spectral radiance standard detector is a key unit of the new radiometric calibration technology, and has potential applications in radiometric calibration of field, air-borne and space-borne sensors. The high-accuracy measurement of weak signal is a hard technology problem. A solution based on Σ-Δ ADC is given. It is proved that the solution is an effective means to solve the weak signal measurement in the field of optical radiometric high-accuracy measurement. 