ADTGS stands for L-α-Alanine Doped Deuterated Triglycine Sulphate. This is a type of pyroelectric crystal that is formed by doping Deuterated Triglycine Sulphate (DTGS) with L-α-Alanine. The doping of DTGS with L-α-Alanine helps to improve its pyroelectric properties, making it useful for a variety of applications, such as infrared detection and thermal imaging.