TW201400793A - Simulation system of material liquid level sensor - Google Patents

Abstract

The invention relates to a simulation system of a material liquid level sensor. The simulation system includes a light emitting module, a light receiving module, a signal processing module, a simulation module and an output module. An inverter is disposed in the simulation module. The light emitting module emits light based on the reflection of the material. The reflected light is received by the light receiving module. A light sensing element in the light receiving module coverts a light signal to a corresponding electricity signal. The signal processing module analyzes the electricity signal to form a low level signal or a high level signal for outputting by the output module. The simulation module can switch an in-use mode to a simulation mode. The inverter inverts the analyzed product of the signal processing module to covert the low level signal to the high level signal or vice versa for outputting with the output module. The user can simulate the status of the liquid sensor when the material level is high or low to test whether the material liquid level sensor works properly.

Description

Liquid level sensor simulation system

The present invention relates to an analog system, and more particularly to an analog system for a liquid level sensor.

Liquid level sensors play an important role in warehousing management. All types of industries involved in warehousing, such as petrochemical industry, bulk food industry, feed industry, steel industry, cement industry, etc., mainly rely on sense The detector's probe detects the inventory in the warehouse to monitor the reserves in the warehouse.

There is an optical sensor, please refer to FIG. 8 , which includes a light emitting module 80 , a light receiving module 81 , a signal processing module 82 and an output module 83 . The light receiving module 81 . There is a photosensitive element inside to convert the optical signal into an electrical signal. When the light is emitted from the light emitting module 80, the light is reflected by the material in the storage, and the reflected light is obtained by the light receiving module 81 to be converted into a corresponding electrical signal, and then the signal processing module 82 is used. After analysis, the output module 83 can output the result of the analysis by the signal processing module for the user to know the material reserves in the storage.

However, when the sensor is manufactured, most of them will first test whether it is normal. The test method is to place the sensor in a warehouse with materials or liquid materials to actually measure the height of the materials in the warehouse. Confirm that the liquid level sensor is normal.

In the above method for testing the sensor, if the stored liquid level is a high level, if it is to test whether the sensor is normal at a low level, the multi-system waits for the reserve in the storage to drop to a low level. After the test, and vice versa; However, the above test method is inefficient. It takes too much time to wait for the high level to drop to the low level or the low level to the high level. Therefore, there is an analog system that can simulate the height of the liquid level and shorten the test. Time, for example, in the U.S. Patent No. 4,354,180, which discloses that the height of the liquid level can be simulated by an analog system, thereby testing whether the liquid level sensor is abnormal. Referring to FIG. 9, the simulation system has a light emitter 90, An optical receiver 91, a probe 92, a light source switch 93 and a height calculation module 94, the probe 92 is formed of a transparent material, and a reflective groove 921 is formed at the upper end, and a triangular pyramid is formed at the lower end. The reflective surface 922, the height calculation module 94 has an amplifier 941, a switch 942 and a liquid level detector 943, mainly if the probe 92 is in the air (the liquid level is low), the light source switch After the power is turned on, the light emitter 90 emits a light L, which then enters the probe 92 and is reflected by the reflective surface 922 to the light receiver 91, and the light L also enters the reflective groove 921, and Inverted by the bottom surface of the reflective groove 921 And entering the light receiver 91, wherein the refractive index of the probe 92 is greater than the refractive index of the air, and the light L corresponds to the reflective surface 922 is greater than the critical angle of the light refraction, that is, if the probe 92 is located In the air, the light L will be totally reflected on the reflecting surface 922, so the light L will be reflected to the light receiver 91. Conversely, if the probe 92 is placed in the liquid, the refractive index of the probe 92 is equivalent to The light has a refractive index of light, so that the light L will pass through the reflecting surface 922, so that the light receiver 91 cannot obtain the light L; and the light L is irradiated to the reflecting groove 921 by scattering, and the reflecting groove 921 is used. The light receiver 91 can receive the light L, wherein the light receiver 91 has a photosensitive element, which can generate a corresponding voltage threshold according to the brightness of the light, so if the probe 91 is located in the air, The light receiver 91 When the light L is obtained from the reflecting surface 922 and the reflecting groove 921, the light receiver 91 induces a high voltage threshold (5 V). If the probe 91 is in the liquid, the light receiver 91 is only self-reflecting. The light L is obtained in the groove 921, so the light receiver 91 induces a lower voltage threshold (2V), thereby using a standard voltage value in the liquid level detector 943 of the height calculation module 94 to determine that the liquid is low. The material level or the high level, if the voltage threshold is greater than the standard voltage value, that is, the liquid is low, and vice versa, and then transmitted to the monitoring terminal for the user to know.

The height calculation module 94 is configured to be switched to a test mode by the user, that is, if the probe 92 is located in the liquid, the original sensing height should be a high level, and the switch 942 can The standard voltage value of the liquid level detector 943 is reduced to 1 volt, so the standard voltage value is lower than the voltage threshold (2V) of the liquid at the high level, which can be simulated as a low level, and vice versa if the probe 92 is in the air. The liquid level is low, and the light source switch 93 is turned off. Since the light receiver 91 cannot receive light, the voltage threshold is represented as 0 volt, so the standard voltage value is greater than the voltage threshold ( 0V), you can simulate the condition of the sensor when the liquid height is high.

However, when the standard voltage value is reduced to 1 volt in the above analog system, the voltage threshold is easily drifted due to impurities doped in the liquid, leading to the state that the liquid cannot be simulated at a low level, and thus the feeling is mistaken. The tester is abnormal, and the test method of the liquid at the high level is complicated, which causes inconvenience to the user. In view of the above problems, it is necessary to solve the problem and seek a feasible solution.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide a simulation system for a liquid level sensor, which is convenient for a user to simulate a material to be tested as a high level or a low level, and to test the liquid level of the material. Whether the detector is normal.

The technical means for achieving the above object is that the liquid level sensor includes: a light emitting module; a light receiving module having an output end, wherein the light receiving module is provided with a photosensitive element, thereby Converting the optical signal into a corresponding electrical signal and outputting it from the output end; a signal processing module having an input end and an output end, the input end being electrically connected to the output end of the optical receiving module; an analog mode a set having an inverter and a switch, the inverter input being electrically connected to the output of the signal processing module, the input end of the switch being switchably coupled to the output of the inverter and the foregoing The output end of the signal processing module is electrically connected, and the switch is adapted to switch the analog module into a usage mode and an analog mode; an output module has an input end and an output end, and the input end is connected to the foregoing The switch is electrically connected; according to the above structure, the liquid level sensor is mainly used to cut the switch in the analog module into a usage mode, and the input end of the switch is connected to the signal processing module. Output The light-emitting module emits light, and is reflected by the material and received by the light-receiving module. The light-receiving component of the light-receiving module converts the optical signal into a corresponding electrical signal, and then transmits the signal to the signal processing. Module, the signal processing module receives telecommunication After discriminating that the height of the material is high, it is transmitted to the output of the output module for the user to monitor. If the light receiving module cannot obtain the light reflected by the material, the signal processing module depends on the corresponding electrical signal. The discriminating is low level; if there is a demand for the liquid level sensor of the test object, the switch of the analog module is switched to the analog mode, and the input end of the switch is electrically connected with the output of the inverter. Connected, so the signal processing module separately determines the high or low level of the material height according to the electrical signal, and then outputs the output to the output module through the inverter, wherein if the signal processing module passes the electrical signal When the high level is determined, because the analog module is in the analog mode, the output signal of the signal processing module is transmitted to the output module via the inverter, and the user can then use the high material level in the actual material. The simulation is a low level. Conversely, if the material height is low, the inverter can be simulated as a high level, so that in this simulation mode, the convenient liquid level sensor simulates the storage. Height to test the liquid level Whether the detector is normal at a high level or a low level, so that the analog module can be quickly switched to the analog mode, and the analog module has the inverter, so it can correctly The low level conversion to high level or high level is converted to low level, so it can be used in liquid or partially turbid liquid, and will not cause test abnormality due to signal offset, so that users can quickly test it. Whether the liquid level sensor is normal.

Referring to FIG. 1 , the liquid level sensor includes a light emitting module 10 , a light receiving module 20 , a signal processing module 30 , an analog module 40 , and a Output module 50, wherein: The light emitting module 10 is configured to emit light to the material or liquid to be tested. In this embodiment, the light emitting module 10 is further provided with a light modulation module 11 for adjusting the light emitting module 10 to emit The intensity, phase, illuminating field type, etc. of the light are used for different materials or liquids, and the light emitting module 10 can be a wide spectrum light source such as an LED or a neon (Ne) lamp, or a laser diode. (Laser Diode) and other narrow-spectrum light sources, and the light modulation module 11 can be a pinhole, a photointerrupter, an Etalon, a grating, or an optical amplifier (Amplifier).

The light receiving module 20 has an output end, and the light receiving module 20 has a photosensitive element 21 therein, thereby converting an optical signal obtained by the light receiving module 20 into an electrical signal, and outputting the output signal. The component 21 can be a photoresistor, a photodiode, a photonic crystal, a CCD or a CMOS, or the like.

The signal processing module 30 has an input end and an output end. The input end is electrically connected to the output end of the optical receiving module 20 to obtain the electrical signal, and is analyzed by the signal processing module 30 as a high material. The bit signal or a low level signal is output by the output.

The analog module 40 provides a switching mode of a usage mode and an analog mode, and has an inverter 41 and a switcher 42 (shown in FIG. 2), the inverter 41 input terminal and the signal processing The output of the module 30 is electrically connected, and the switch 42 is a single pole double switch (SPDT, Single pole, double throw), so it has a common contact, a first contact and a second contact. The first contact is electrically connected to the output end of the signal processing module 30, and the second contact is electrically connected to the output of the inverter. In this embodiment, when the common contact and the first contact are connected, the connection is entered. Mode, wherein the common contact and the second contact are connected to the simulation mode, and the analog module 40 further has a The driver 43 controls the switching of the switch 42, that is, the user can control the switch 42 through the driver 43 to switch between the use mode or the analog mode.

The output module 50 has an input end and an output end. In this embodiment, the input end of the output module 50 is electrically connected to the common contact of the switch 42.

According to the above-mentioned structure, the liquid level sensor is configured to drive the common contact of the switch 42 to be connected to the first contact, thereby entering the use mode, so that the light emitting module 10 emits a After the light is received by the light receiving module 20, it is converted into an electrical signal through the photosensitive element 21, and the electrical signal is analyzed by the signal processing module 30 to know that the height of the material is a high level, and then The output module outputs the display. Otherwise, if the light receiving module 20 cannot obtain the light, the signal processing module 30 determines that the height is a low level according to the corresponding electrical signal, so that the user can monitor the light. The stock of materials, in which, as shown in FIG. 3, when the test liquid level sensor is to be simulated, the material height is made low and the switch 42 is driven by the driver 43 to make the joint. The output of the signal processing module 30 is converted to a high level signal by the output of the signal processing module 30, so that the output module 50 is thus displayed as a high level H. (as shown in Figure 4), conversely, if the material is high When the original material is high level H (as shown in FIG. 5), the inverter 41 can be converted into a low level signal, so that the output of the output module 50 is displayed as a low level L (see FIG. 6). As shown in the figure, the analog module 40 can be used by the user to switch between the usage mode or the analog mode, and the high-level signal can be easily inverted to the low by using the inverter 41. The material level signal is inverted from a low level signal to a high level signal, which is convenient for the user to simulate the height of the material. The liquid level sensor is normal, and this configuration can be widely applied to materials or liquids.

Referring to FIG. 7 , the basic structure of the present invention is substantially the same as that of the previous embodiment. The difference is that the output module 50 further has a time delay 60 at the output end, which is mainly When the liquid system is a high viscosity fluid (Viscous Fluid) or a high viscosity fluid (High Elastomeric Fluid), the liquid level will remain on the liquid level sensor when the liquid level is lowered, thereby causing the liquid level sensing. The time delay device 60 is used to simulate the condition that the liquid to be tested is a high-viscosity fluid or a high-viscosity fluid and remains on the liquid level sensor, so that the user can simulate in all directions. The liquid level sensor is tested to avoid anomalies when used with different liquids to be tested.

10‧‧‧Light emitting module

11‧‧‧Light Modulation Module

20‧‧‧Light receiving module

21‧‧‧Photosensitive elements

30‧‧‧Signal Processing Module

40‧‧‧simulation module

41‧‧‧ reverser

42‧‧‧Switcher

43‧‧‧ drive

50‧‧‧Output module

60‧‧‧Time delay

80‧‧‧Light emitting module

81‧‧‧Light receiving module

82‧‧‧Signal Processing Module

83‧‧‧Output module

90‧‧‧Light emitter

91‧‧‧Optical Receiver

92‧‧‧ probe

93‧‧‧Light source switch

94‧‧‧High Calculation Module

921‧‧‧Reflection trough

922‧‧‧reflecting surface

941‧‧Amplifier

942‧‧‧Switcher

943‧‧‧Level detector

Figure 1: Schematic diagram of one of the structures of the present invention.

2 is a detailed structural diagram of the analog module of the present invention.

Figure 3 is a schematic illustration of a low level state in accordance with one embodiment of the present invention.

Figure 4 is a schematic illustration of a simulated high level state in accordance with one embodiment of the present invention.

Figure 5 is a schematic view of a high level state of an embodiment of the present invention.

Figure 6 is a schematic illustration of a simulated low level state in accordance with one embodiment of the present invention.

Figure 7 is a schematic view of another embodiment of the present invention.

Figure 8 is a schematic diagram of one of the prior art architectures.

Figure 9 is a schematic diagram of the simulated liquid level height for one of the prior art.

10‧‧‧Light emitting module

11‧‧‧Light Modulation Module

20‧‧‧Light receiving module

21‧‧‧Light-sensitive components

30‧‧‧Signal Processing Module

40‧‧‧simulation module

43‧‧‧ drive

50‧‧‧Output module

Claims (7)

An analog liquid level sensor simulation system includes: a light emitting module; a light receiving module having an output end, the light receiving module has a photosensitive element built therein, thereby converting the optical signal into a corresponding The signal signal is outputted by the output terminal; a signal processing module has an input end and an output end, the input end is electrically connected to the output end of the light receiving module; and an analog module has an inverter And a switch, the inverter input is electrically connected to the output end of the signal processing module, and the input end of the switch is switchably connected to the output end of the inverter and the output end of the signal processing module The switch is configured to switch the analog module into a use mode and an analog mode; an output module has an input end and an output end, and the input end is electrically connected to the switcher. The analog system of the liquid level sensor according to claim 1, wherein the switch is a single pole double pole switch; the switch has a common contact, a first contact and a second contact; a contact is electrically connected to the output end of the signal processing module; the second contact is electrically connected to the output of the inverter; the common contact enters a usage mode when connected with the first contact, and the common contact Enter the analog mode when the second contact is connected. The simulation system of the liquid level sensor according to claim 2, wherein the simulation module is provided with a driver for controlling the switchover. The simulation system of the liquid level sensor according to claim 1, the light emission The shooting module is further provided with a light modulation module. The simulation system of the liquid level sensor according to claim 4, wherein the light modulation module can be a wide spectrum light source such as an LED or a xenon lamp, a narrow spectrum light source such as a laser diode, a pinhole, and a light. Interrupters, frequency multipliers, gratings or optical amplifiers. The simulation system of the liquid level sensor according to claim 1, wherein the photosensitive element can be a photoresistor, a photodiode, a photoelectric crystal, a CCD or a CMOS. The simulation system of the liquid level sensor according to any one of claims 1 to 6, wherein the output module is further provided with a time delay at the output end.