Signal Strength Indicating Device Based on Mixed-Frequency Detection
A technology of signal strength indication and frequency mixing, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve problems such as inability to achieve the strongest signal test and analysis, low signal strength, and inability to detect the strongest signal, etc., to achieve the best Excellent detection effect, good real-time performance, and wide application prospects
Active Publication Date: 2015-09-16
山东神戎电子股份有限公司
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Problems solved by technology
In the detection of weak optical signals, due to the low signal strength, high accuracy is required. If there is no test comparison of the signal strength of each point, the strongest signal will often not be detected, and the test and analysis of the strongest signal will not be realized.
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[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0011] Such as figure 1 As shown, the circuit principle diagram of the signal strength indicating device of the present invention is given, which includes a laser 1, a display drive circuit 2, a photodetector 3, a weak signal amplification circuit 4, a mixer 5, an operational amplifier 6, and an LED lamp group 7. The internal optical path 8 and the local oscillator 9; the laser 1 is used to generate a laser beam, and the same laser beam is divided into a measuring beam and a reference beam after passing through the internal optical path 8, and the measuring beam is used to hit the target 10, and the reference beam passes through the internal The optical path 8 is then irradiated onto the photodetector 3, and coherently superimposed with the emitted optical signal. The photodetector 3 can convert the optical signal within the laser spectrum range genera...
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The invention relates to a signal intensity indicating device based on frequency mixing detection. The signal intensity indicating device based on the frequency mixing detection comprises a laser, a photoelectric detector, a weak signal amplification circuit and a display driving circuit. The signal intensity indicating device based on the frequency mixing detection is characterized in that light beams output by the laser are divided into two beams, one beam is a measuring light beam, the other beam is a reference light beam, output signals of the photoelectric detector are amplified by the weak signal amplification circuit and then are input in a frequency mixer, output signals of the frequency mixer are amplified by an operational amplifier and then are connected to the input end of the display driving circuit, and an LED lamp set used for displaying the size of target diffuse reflection intensity is connected at the output end of the display driving circuit. According to the signal intensity indicating device based on the frequency mixing detection, the photoelectric detector can collect weak diffuse reflection light in any direction and convert the weak diffuse reflection light into electrical signals, and angle limitation brought by the adoption of a specular reflection principle is avoided. Software analysis is not needed in a detecting and displaying process, response is quick, and real-time performance is good. Working staff can quickly determine a detection area according to signal intensity, and wide application prospects are achieved.
Description
technical field [0001] The present invention relates to a signal strength indicating device based on frequency mixing detection, more specifically, to a signal strength indicating device based on frequency mixing detection which can effectively measure the diffuse reflection intensity of a target to laser light. Background technique [0002] Today's society has entered the information age, photoelectric detection has been more and more widely used, in military and civilian economic fields, such as radiation measurement and detection, industrial automatic control, carrier signal transmission, weak signal modulation and demodulation, etc. Widely used. In the detection of weak optical signals, due to the low signal strength, high accuracy is required. If there is no test comparison of the signal strength of each point, the strongest signal will often not be detected, and the test and analysis of the strongest signal will not be realized. Contents of the invention [0003] I...
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IPC IPC(8): H04B10/071
Inventor 丁鉴彬马祥云陶小凯路瑜亮姜河
Owner 山东神戎电子股份有限公司