Electron cyclotron emission (ECE) imaging has been an important tool to investigate behaviors of temperature perturbations in the specific spatial area. So far, we have applied ECE detection system to a LHD plasma to measure electron temperature fluctuations in core region, however, it was difficult to distinguish perturbed temperature signals to a noise, which is naturally consisted in radiometry features and so on. Recently, we have optimized an ECE detector array especially in sensitivity to

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... increase signal to noise ratio. An intermediate frequency(IF) system composed of commercial components have been replaced by an integrated system utilizing millimeter(microwave) integrated circuit technology(MIC) to fabricate a compact system maintaining the performance of the commercial system. As a result of application to the LHD plasma, we have successfully obtained ECE signal even in comparably low temperature operation sequence.