Gas-sensing applications commonly use nanomaterials (NMs) because of their unique
physicochemical properties, including a high surface-to-volume ratio, enormous number of …

The phase-sensitive detection (PSD), popularly referred to as lock-in amplifier (LIA) has
been around for quite a long time. Lock-in amplifier has been quite a versatile measurement …

In this article, a convolutional neural network (CNN)-based electronic nose system is
proposed, which utilizes time series features to classify the freshness of food. The electronic …

The accuracy of modern scientific research and technological advancement is highly reliant
on the ability to accurately measure weak signals. The lock-in amplifier (LIA) represents an …

The accurate identification of trace gases has become an important subject in the field of
environmental monitoring due to the ppb-level permissible upper limit of indoor harmful …

With the development of science and technology, gas sensors have gradually expanded to
many vertical fields. However, each application requires different technical requirements for …

Bioimpedance spectroscopy is used in a wide range of biomedical applications. This paper
presents an integrated analog readout, which employs synchronous detection to perform …

Methane is a major greenhouse gas and a precursor of tropospheric ozone, and most of its
sources are linked to anthropogenic activities. The sources of methane are well known and …

In this paper, a gas detection microsystem which consists of a highly sensitive micro-electro
mechanical systems (MEMS) gas sensor and a CMOS integrated circuit, including a read …

A novel fully-analog lock-in amplifier for the accurate measurements of low quantities of gas
in sensor applications is here presented. When compared with commercial lock-in and other …