{'fraction_non_alphanumeric': 0.026027397260273973, 'fraction_numerical': 0.009589041095890411, 'mean_word_length': 4.991803278688525, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Flexible epidermal device for the RFID-based potentiometric sensing of skin parameters

Non-invasive monitoring of biological parameters can benefit from Radio frequency Identification (RFID) devices attached over the skin. In this paper, a new lightweight, compact, and fully passive epidermal electronic device is proposed, capable of measuring surface pH. By integrating a self-tuning IC and a varactor diode as transducer, the mapping from the chemical agent to the output of the IC itself is achieved. To fully control the sensitivity, a closed-form formulation of the sensing mechanism is derived. The device is applicable over multiple body areas and readable up to 70 cm, with an average realized gain of −12dB at 868 MHz.