Stabilization of parameters of optoelectronic devices on semiconductor emitters

Purpose given work was creation of an optoelectronic device for measuring the humidity of silkworm cocoons on basis mid-IR LEDs. An optoelectronic device has been developed for measuring the humidity of silkworm cocoons based on mid-IR LEDs, allowing measurements in real mode with an accuracy of 1.5%. Analysis of the spectral characteristics of silkworm cocoons shows that in the optical range of 0.4…1.2 μ m, the cocoon shell transmits radiation well , and radiation with a wavelength of 1…2 μ m is well reflected. In the spectral region of 1.8-2.2 μ m, the reflectivity of silkworm cocoons is 85%, then drops to 14" at wavelengths of 3 μm. Transmission of radiation by the pupa in the spectral region of 0.4-10 μ m was not detected. The obtained data on the optical properties of silkworm cocoons made it possible to use the principle of reflection to control humidity, because at wavelengths of 1.95 and 2.22 μ m , where there are maxima and minima of water absorption, the shell of silkworm cocoons transmits little IR radiation, but at these wavelengths it has good reflectivity, so it is necessary to use the principle of reflection of IR radiation. In the optoelectronic device for measuring the humidity of silkworm cocoons, LEDs with emission spectra of 2.2 μ m are used as a reference channel , and LEDs with emission spectra of 1.94 μ m are used as a measuring channel . To record signals, a photodiode with a wide sensitivity range of 1.5 - 2.4 μ m was used. A schematic diagram has been proposed that ensures the main condition for two-wave optoelectronic devices, in terms of timing and temperature stability of LED parameters and the equality of their initial reference, measuring radiation fluxes, which determine the measurement accuracy.

RETRACTED: Optoelectronic device for measuring the humidity of silkworth cocoons

Kuldashov,

Daliyev,

Komilov

et al. 2024

Effects of the interaction of chlorine with PbTe surface and their effect kinetic parameters of strain-sensitive films

Otajonov,

Khalilov,

Juraev

et al. 2024

In this work, the kinetic phenomena of strain-sensitive thin PbTe films with the presence of chlorine are studied. It has been established that when adding a legirant, the concentration of current carriers and the mobility increase 1.9*1020cm-3, Ϭmax = 4959 ohm-1sm-1, respectively. It has been determined that the coefficient of strain sensitivity of polycrystalline PbTe films doped with chlorine reaches up to 35000 in the strain range (1÷8.5)·10-7 rel.un.

Torqueless transmission

Tillaboev,

Xatamova,

Rustamov

et al. 2024

An experimental sample of a drill implementing a torqueless method of operation has been developed, manufactured and tested. As a birotative motor, a standard DC commutator motor DP12-24 is used, supply voltage 24 V DC, rated rotation speed 3500 rpm, maximum torque 3.2 kg cm. For hand tools that use low-power motors ( up to 1 kW). A birotative electric motor has the ability to rotate both the rotor and the stator in the direction opposite to the rotor. The rotor and stator are equipped with pulleys to transmit rotation to the working shaft, with the rotor transmitting rotation in the forward direction, and the stator in the opposite direction. Thus, the rotor and stator are connected by a working shaft into a single rotation transmission system, ensuring the distribution of speeds of the rotor and stator in such a way that the rotor and stator rotate at the same speed in opposite directions.