In this paper, a Fabry-Perot interferometer filled with ultraviolet curing adhesive sensitization of high sensitivity fiber optic temperature sensor is proposed, by filling the F-P cavity with ultraviolet curing adhesive, due to the high coefficient of thermal expansion of the ultraviolet curing adhesive, the traditional fiber optic temperature sensor is achieved by primary sensitization. Combined with the optical vernier effect sensitization mechanism for secondary sensitization of the fiber optic Fabry-Perot interferometer, the sensor achieves a compact polymer-core sensing probe fiber optic interferometer structure and exhibits a temperature detection sensitivity of -17.55 nm/℃. This paper uses the F-P cavity peak phase spectral tracking algorithm for the vernier response spectrum collected by the vernier effect to obtain the peak spectral tracking and realise the high sensitivity detection.
Surface enhanced Raman spectroscopy is a vibrational spectroscopy technique that enhances molecular Raman signals through noble metal nanostructures, commonly used in biological or chemical analysis in the fields of food, environment, and medicine. The controllable, repeatable preparation of nano periodic structures with high-density hotspots is currently the research highlights. This article introduces the method of using ion beam evaporation deposition and ultra-thin dual pass anodized aluminum oxide (AAO) template to prepare low-cost, large-area periodic nanodots array SERS substrates, and simulates the absorption rates of gold nanodots array with different diameters. The surface enhanced Raman spectroscopy characteristics of the SERS substrates were tested and analyzed using Rhodamine 6G as the probe molecule. The results showed that the SERS substrate of gold nanodots with a diameter of 260nm and a thickness of 35nm prepared on Si substrate can detect 10-7mol/L of Rhodamine 6G. The enhancement effect of the periodic structure of the gold nanodots at 1361.555 cm-1 is 22 times that of ordinary gold films of the same thickness.
Aiming at the existing density detection technologies, this paper proposes and designs a liquid refractive index (RI) sensor based on an all-fiber online Fabry-Perot interference cavity (FPI). We designed a real-time monitoring system by LabVIEW and performed density calibration, bubble and impurity interference and stability tests. The experimental results show that the effective cavity length of the FP cavity and the density have a good linear relationship, the fitting coefficient of the curve is as high as 0.998. Excluding the influence factors such as impurity,air bubbles and high temperature, the maximum offset between the measured value after temperature compensation of liquid density and the real value is within ±0.0024g/cm³.
In recent years, industrial production and national defense modernization have put forward higher requirements for the performance of sensors. The research and development of high-performance new sensors has attracted more and more attention. For gas sensing, the development of high performance and low-cost medium-wave infrared detectors at high operating temperature or even room temperature is one of the main development directions in the future. In recent years, HgCdTe, quantum well and antimonide infrared detectors have been the research hotspots of mid-wave infrared detectors. They have their own characteristics in device physics and device performance, and have their own advantages in gas detection applications. This paper summarizes the advantages and disadvantages of three kinds of mid-wave infrared detectors, and introduces the research status and development.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.