# US 11,112,353 B2 · Residual toxicant detection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,353 B2 - Document ID: US11112353B2 - Status: Granted - Kind: B2 - Application number: 16/728,963 - Filed: 2019-12-27 - Published: 2021-05-27 - Granted: 2021-09-07 - Earliest claimed: 2019-11-22 - Assignees: Industrial Technology Research Institute - Applicants: Industrial Technology Research Institute - Inventors: Chih-Hao Hsu; Jui-Hung Tsai; Ying-Hao Wang; Chia-Jung Chang - Web page: https://patentgrep.com/patent/US11112353B2 ## CPC - G01N 21/255: {Details, e.g. use of specially adapted sources, lighting or optical systems} - G01N 21/8507: {Probe photometers, i.e. with optical measuring part dipped into fluid sample} - G01N 2201/0221: Portable; cableless; compact; hand-held - G01N 2201/062: LED's - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract A residual toxicant detection device for testing residual toxicant in an aqueous solution is disclosed, which includes a first space cavity, a second space cavity, a connecting frame and a sensing cavity. The first space cavity includes a light source and a lens. The second space cavity includes a photo sensor and a circuit module. The connecting frame is configured to connect the first space cavity and the second space cavity. The sensing cavity for receiving an aqueous solution is formed between the first space cavity and the second space cavity and at one side of the connecting frame. The light source emits a light with a wavelength range. The photo sensor receives the sensing signal of the light passing through the sensing cavity. The circuit module is configured to calculate the absorbance and the variation in absorbance of the residual toxicants in the aqueous solution. ## Claims ### Claim 1 A residual toxicant detection device, comprising: a first space cavity, comprising: a light source configured to emit a light with a specific wavelength range and disposed on a substrate; a lens separated from the light source by a first distance; and a fixing ring whose top configured to fix the lens, wherein the fixing ring has a funnel-shaped structure at an end by which the fixing ring fixes the lens, and a side wall of the funnel-shaped structure has an angle of inclination extended upwards at a part close to the light source: a second space cavity, comprising: a photo sensor configured to receive the light with the specific wavelength range and obtain a sensing signal; and a circuit module electrically connected to the light source and the photo sensor; a connecting frame configured to connect the first space cavity and the second space cavity; and a sensing cavity formed between the first space cavity and the second space cavity and on one side of the connecting frame and configured to receiving an aqueous solution, wherein the light emitted by the light source of the first space cavity passes through the sensing cavity to enter the photo sensor of the second space cavity. ### Claim 2 (depends on 1) The residual toxicant detection device according to claim 1, wherein a bottom of the fixing ring is further configured to fix the light source such that the light source and the lens maintain the first distance. ### Claim 3 (depends on 1) The residual toxicant detection device according to claim 1, wherein the angle of inclination of 30°. ### Claim 4 (depends on 1) The residual toxicant detection device according to claim 1, wherein the circuit module calculates an absorbance of the residual toxicant in the aqueous solution according to the sensing signal. ### Claim 5 (depends on 1) The residual toxicant detection device according to claim 1, wherein the circuit module calculates a variation in the absorbance of the residual toxicants in the aqueous solution by continuously detecting the aqueous solution in the sensing cavity by use of the light source and the photo sensor. ### Claim 6 (depends on 1) The residual toxicant detection device according to claim 1, further comprising: a battery configured to provide power for the light source, the photo sensor and the circuit module. ### Claim 7 (depends on 1) The residual toxicant detection device according to claim 1, wherein the light source and the photo sensor are respectively disposed on two sides of the sensing cavity, or disposed on two opposite sides of the first space cavity and the second space cavity. ### Claim 8 (depends on 1) The residual toxicant detection device according to claim 1, further comprising: a display unit disposed on an outer surface of the second space cavity and configured to displaying different colors according to a variation in the absorbance. ### Claim 9 (depends on 1) The residual toxicant detection device according to claim 1, wherein the second space cavity further comprises a switch button configured to activate an operation of the residual toxicant detection device. ### Claim 10 (depends on 1) The residual toxicant detection device according to claim 1, further comprising: a sensing cavity cover configured to cover the sensing cavity. ### Claim 11 (depends on 10) The residual toxicant detection device according to claim 10, wherein the sensing cavity cover comprises a plurality of holes which are arranged neatly or alternately. ### Claim 12 (depends on 11) The residual toxicant detection device according to claim 11, wherein an area of a first opening of the holes on an outer surface of the sensing cavity cover is greater than an area of a second opening of the holes on an inner surface of the sensing cavity cover. ### Claim 13 (depends on 11) The residual toxicant detection device according to claim 11, wherein a shape of the holes is circular, squared, rectangular or hexagonal. ### Claim 14 (depends on 1) The residual toxicant detection device according to claim 1, further comprising: a dust-proof cap configured to cover the first space cavity, the sensing cavity and the connecting frame. ### Claim 15 (depends on 1) The residual toxicant detection device according to claim 1, wherein the first space cavity further comprises a bottom lid and a waterproof ring. ### Claim 16 (depends on 1) The residual toxicant detection device according to claim 1, wherein the light source and the photo sensor are plural.