Senba Sensing Technology Co., Ltd.

Infrared thermopile sensor combined with Fresnel lens can greatly enhance its detection range. In general, the maximum distance of detecting the surface temperature of human body can reach 6-10m under ideal conditions. The distance coefficient ratio can be expressed as D:S, that is to say, if the object (eg: circle) is D away from the detector, the temperature measurement is accurate as long as the diameter of it is greater than S. If the diameter of the object is less than S or the shape of the object is irregular, part of the infrared signal received by the infrared thermopile sensor will show the ambient temperature behind the object, which will cause the obtained temperature to be lower or higher (usually lower). If the detection distance is less than D, it will be reduced according to the proportion of D:S. Therefore, the closer the detection distance is, the higher the probability of measurement accuracy is. In general, as long as the object is large enough or the object is f...

Fog, rain and dust rather than night and day will affect the accuracy of temperature measurement of infrared thermopile sensor. The reason is that the infrared light will be attenuated to some extent under these conditions, but its attenuation will not be very large. Generally, the actual temperature measurement accuracy will not be greatly affected. The infrared probe has also been applied in the fire-fighting and fog conditions. Effect: dust ＞ rain ≈ fog. The situation of weather change is quite complex. If the temperature is not changed suddenly, but changed slowly in winter and summer, day and night, and inside and outside the house, the resistance of the infrared thermopile sensor measuring the ambient temperature will make compensation, and the subsequent circuit will calculate this compensation and convert it to the actual temperature measurement value. Under this circumstance, the weather change or the environmental temperature change will not affect the temperature measure...

The optical resistance sensor of photoelectric switch refers to the sensor made of the piezoresistive effect of monocrystalline silicon material and integrated circuit technology. The photoresist effect means that when the force acts on the silicon crystal, the lattice of the crystal deforms to scatter the carrier from one energy valley to another, which changes the mobility of the carrier and affects the average longitudinal and transverse amount of the carrier. Thus, the resistivity of silicon changes. This change varies with the orientation of the crystal, so the piezoresistive effect of silicon is related to the orientation of the crystal. The resistivity of monocrystalline silicon material will change after being subjected to force, and the electrical signal output proportional to the force change can be measured by measuring circuit, and results contribute to analyze the magnitude of the applied force accordingly. The diffusion silicon optical force sensor integrates the resi...

Nowadays thermopile reactor sensors and pyroelectric sensors commonly used in daily life. However, are they sharing the same scientific principles? What are the differences between them? Knowledge of Thermopile sensor (1) Introduction A thermopile reactor is a component that converts temperature difference and electric energy into each other. It consists of two or more thermocouples connected in series. The thermopile potential output is superimposed on each other, which can be used to measure slight temperature difference or average temperature. When the temperature is measured by the thermopile sensor , the potential difference generated by a single thermocouple is too small to be measured, and the large expense of using high precision operational amplifier can be saved. (2) Structure Structurally, the thermopile stack consists of multiple thermocouples. The radiation receiving surface is divided into several blocks, each of which is connected by a thermocouple. According to diff...

Fresnel lenses are mostly thin sheets made of polyolefin materials. One side of the lens surface is smooth, and the other side is engraved with concentric circles from small to large. The rings on the flash of the mobile phone come from a Fresnel lens. The purpose of the flash is to illuminate the subject in front. In order to make full use of the light emitted by the lamp tube, we need to focus these lights forward. For the light emitted to the back of the tube, people first think of using a concave reflector, but the light (yellow) that the concave reflector shoots toward the front and the side is only a small part, that is, the light that is really straight forward can be illuminated. The light from other directions was all lost when shooting the subject; although the later deepened mirror improved the problem of light emission, it greatly increased the thickness of the flash, and some light (indicated in blue) was still lost. In pursuit of ultra-thin mobile phones, people use th...

In 2020, the new crown pneumonia epidemic has caused products such as forehead thermometers and sensors that are usually unpopular or even unknown to appear. From crazy reselling to now gradually cooling down as the epidemic dissipates. As the core component of the forehead thermometer, how should the infrared sensor develop? The infrared sensor is the core component of the forehead thermometer. With the increasingly serious and complex changes in the epidemic situation, the infrared sensor has become a hard-to-find product in the market. Why is infrared sensor so scarce? First of all, the radiation characteristics of the infrared sensor, the size of the radiation energy, and the wavelength distribution are closely related to the surface temperature of the object. Conversely, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately predicted. This is the mechanism of infrared radiation temperature measurement. Secondly, the market d...

Photosensitive resistance is also known as light pipe, and the characteristic of photosensitive resistance is that under the irradiation of specific light, its resistance value decreases rapidly and can be used to detect visible light. Photoresistor is a kind of resistance made by the photoelectric effect of semiconductor, whose resistance value changes with the intensity of incident light; if the incident light is strong, the resistance decreases, and if the incident light is weak, the resistance increases. For example, a photoresistor is used in the sound control lamp as a device to control the light during the day. Photoresistors are generally used for light measurement, light control, and photoelectric conversion (converting changes in light into changes in electricity). Generally, photoresistors are made into a thin sheet structure to absorb more light energy. With the expansion of application areas, the photoresistor industry also faces many problems. Good market prospects have...